Having trouble getting a permissions.yml generated, or even using basic PEX commands in permissionsex

hello, i’m having a hard time with permissionsex. Whenever I type a command such as /pex user it just says that it is not a command. i know i have PEX installed because /pex works. it comes up with the snapshot version. another thing i’m having a hard time with is generating the permissions.yml file. I get a permissionsex.json, and a permissionsex.conf but nothing else.

Sponge, and therefore PEX for Sponge, is vastly different to bukkit, by default all plugin configs are HOCON .conf files, PEX is using .json for permission storage if you use file mode (database mode is broken at the moment) and the command structure is very different, if you want to check your permissions then use
/pex user rawri16 info