I fixed it.

groups:
  default:
    default: true
    prefix: '&5Noobling&f><'
    permissions:
    - modifyworld.*
    - BlockDisguise.disguise
    - MushroomJump.affected
    - securechests.lock
    - securechests.lock.public
    - securechests.lock.transfer
    - trade.ignore
    - trade.request
    - trade.request.command
    - trade.request.right-click
    - trade.request.shift-right-click
    - trade.accept.request
    - trade.accept.request.command
    - trade.accept.request.right-click
    - trade.accept.request.shift-right-click
    - trade.gui.rows.4
    - trade.gui.rows.3
    - trade.gui.rows.2
    - trade.gui.rows.1
  JohnBoy:
    prefix: '&4&ko&5The Great&4&ko&f><'
    permissions:
    - modifyworld.*
    - BlockDisguise.disguise
    - MushroomJump.affected
    - securechests.lock
    - securechests.lock.public
    - securechests.lock.transfer
    - trade.ignore
    - trade.request
    - trade.request.command
    - trade.request.right-click
    - trade.request.shift-right-click
    - trade.accept.request
    - trade.accept.request.command
    - trade.accept.request.right-click
    - trade.accept.request.shift-right-click
    - trade.gui.rows.4
    - trade.gui.rows.3
    - trade.gui.rows.2
    - trade.gui.rows.1
  Pomarf:
    prefix: '&4&ko&1The Only&4&ko&f><'
    permissions:
    - modifyworld.*
    - BlockDisguise.disguise
    - MushroomJump.affected
    - securechests.lock
    - securechests.lock.public
    - securechests.lock.transfer
    - trade.ignore
    - trade.request
    - trade.request.command
    - trade.request.right-click
    - trade.request.shift-right-click
    - trade.accept.request
    - trade.accept.request.command
    - trade.accept.request.right-click
    - trade.accept.request.shift-right-click
    - trade.gui.rows.4
    - trade.gui.rows.3
    - trade.gui.rows.2
    - trade.gui.rows.1

Users:
    Pomarf:
        group:
        - Pomarf
    xXbaconatorXx:
        group:
        - JohnBoy