[Problems with essentials permissons.]

I can't give permissions to normal players on server. i want to add:

     - essentials.help
    - essentials.hat
    - essentials.spawn
    - essentials.chat.shout
    - essentials.itemdb
    - essentials.list
    - essentials.mail
    - essentials.msg
    - essentials.rules
    - essentials.suicide
    - essentials.sethome
    - essentials.home
    - essentials.tpa
    - essentials.tpaccept
    - essentials.tpdeny
    - essentials.warp

To all players but it doesn't work on permissions.yml in /plugins/PermissionsEx. /pex commands don't work either...

Can someone tell me how to modify this files ? >__<

All plugins are downloaded from "plugins" section in Dashboard

 

all permissions.yml file:

groups:
  Gracz:
    options:
      default: true
      prefix: &3[Gracz]
    permissions:
    - modifyworld.*
    - essentials.help
    - essentials.hat
    - essentials.spawn
    - essentials.chat.shout
    - essentials.itemdb
    - essentials.list
    - essentials.mail
    - essentials.msg
    - essentials.rules
    - essentials.suicide
    - essentials.sethome
    - essentials.home
    - essentials.tpa
    - essentials.tpaccept
    - essentials.tpdeny
    - essentials.warp
  Admin:
    default: false
    prefix: &a[Admin]
    permissions:
    - '*'
schema-version: 1