[Skript - Ranks]

For the adding permissions im having trouble figuring out where to add them. This is the skript I have made so far: 

on first join:
    set {rank::%UUID of player%} to "default"

on join:
    if {rank::%UUID of player%} is not set:
        set {rank::%UUID of player%} to "default"

on chat:
    cancel event
    if {rank::%UUID of player%} is "owner":
        broadcast "&l&4[Owner] %player%&8: &f%message%"
    if {rank::%UUID of player%} is "admin":
        broadcast "&c[Admin] %player%&8: &f%message%"
    if {rank::%UUID of player%} is "mod":
        broadcast "&e[Mod] &e%player%&8: &f%message%"
    if {rank::%UUID of player%} is "jrmod":
        broadcast "&e[Jr.Mod] %player%&8: &f%message%"
    if {rank::%UUID of player%} is "default":
        broadcast "&7%player%&8: &7%message%"

command /setrank [<offlineplayer>] [<text>]:
    permission: skript.setrank
    permission message: &cYou may not use that command!
    trigger:
        if arg 1 is set:
            if arg 2 is set:
                if {rank::%UUID of arg 1%} is set:
                    if arg 2 is "owner":
                        set {rank::%UUID of arg 1%} to "owner"
                        send "&7You've set &a%arg 1%'s &7rank to &l&4Owner"
                        make console execute command "/pex user %arg 1% group set (owner)"
                    if arg 2 is "admin":
                        set {rank::%UUID of arg 1%} to "admin"
                        send "&7You've set &a%arg 1%'s &7rank to &cAdmin"
                        make console execute command "/pex user %arg 1% group set (admin)"
                    if arg 2 is "mod":
                        set {rank::%UUID of arg 1%} to "mod"
                        send "&7You've set &a%arg 1%'s &7rank to &eMod"
                        make console execute command "/pex user %arg 1% group set (mod)"
                    if arg 2 is "jrmod":
                        set {rank::%UUID of arg 1%} to "jrmod"
                        send "&7You've set &a%arg 1%'s &7rank to &eJr.Mod"
                        make console execute command "/pex user %arg 1% group set (jr.mod)"
                    if arg 2 is "default":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &8Default"
                        make console execute command "/pex user %arg 1% group set (default)"
                    else if arg 2 is not "admin", "mod", "jrmod" or "default":
                        send "&cThat is not a valid rank"
                else:
                    send "&cPlayer not found"
            else:
                send "&c/setrank <player> <rank>"
        else:
            send "&c/setrank <player> <rank>"

command /ranklist:
    permission: skript.ranklist
    permission message: &cYou may not use that command!
    usage: /ranklist
    trigger:
        send ""
        send "&3Rank List"
        send ""
        send "&l&0[Owner] &8- &7""owner"""
        send "&c[Admin] &8- &7""admin"""
        send "&e[Mod] &8- &7""mod"""
        send "&e[Jr.Mod] &8- &7""jrmod"""
        send "&7Default &8- &7""default"""
        send ""

command /resetrank [<offlineplayer>] [<text>]:
    permission: skript.setrank
    permission message: &cYou may not use that command!
    trigger:
        if arg 1 is set:
            if arg 2 is set:
                if {rank::%UUID of arg 1%} is set:
                    if arg 2 is "owner":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &l&4Default"
                    if arg 2 is "admin":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &cDefault"
                    if arg 2 is "mod":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &eDefault"
                    if arg 2 is "jrmod":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &edefault"
                    if arg 2 is "default":
                        set {rank::%UUID of arg 1%} to "default"
                        send "&7You've set &a%arg 1%'s &7rank to &8Default"
                    else if arg 2 is not "admin", "mod", "jrmod" or "default":
                        send "&cThat is not a valid rank"
                else:
                    send "&cPlayer not found"
            else:
                send "&c/setrank <player> <rank>"
        else:
            send "&c/setrank <player> <rank>"
 

[Skript - Ranks]

Can you add a command for reseting the ranks? I tried to upgrade a player from a mod to a admin but now it says that the player is both a mod and a admin and i would like to reset that. Also if you could add a owner rank that would be great.