You will need the plugins: Luckperms, LPC and Vault once you have added these plugins and restarted your server your going to want to execute the command: /lp group default meta setprefix "&f&lMEMBER" or you own prefix, you can add permissions by using /lp group <group name> permission set <permission> the permissions are usually the plugin followed by a "full stop" to make a group do /lp create group <group name> once thats done add a prefix like so: /lp group <group name> meta setprefix <prefix> to add suffixes do the same thing just with setsuffix instead of setprefix. You can also use the luckperms editor if you dislike executing commands ingame and is also the only way for bedrock players to be given ranks you can do this by executing the command: /lp editor
Thats all cya!