How give pixelmon wondertrade permission?

This is my problem.I download pixelmon and wondertrade mod for my sponge server
But players cant use /wt to trade pokemon , just ops can
I have PermissionsEx ,But I dont know How to give wondertrade permissions for players

I try /pex group pex group gast perm com.wondertrademod.wondertrade.commands true(bukkit permission node)
and /pex group gast perm wondertrade.command.wondertrade true (sponge permission node)
this is Without any help
can anyone help me?

/pex group <groupname> perm <permissionnode> true should grant the permission. note that commands are case sensitive.

you are my Liberator