Hi . I bought today , controlysis plugin from unreal engine marketplace …i see the events , but how can i discover what is my controller? I can’ t find any documentation.Please help me!
Find a thread of that plugin on forums and ask there, you probably get quicker anwser
There is no thread 
Then try to contact author in some way, there not much chance you will get anwser here
You can find the documentation here:
C:\Program Files (x86)\Epic Games\4.12\Engine\Plugins\Marketplace\Controlysis\Documentation
(adjust for your current engine version and ue4 install location)