How to setup Propellerads Conversion tracking?

Hi guys, I'm trying to setup conversion (event is user registration - just a simple registration form) in propellerads. Appreciate any help. I don't have an ad server. Can anyone suggest what to do here? Where can I add the tracking code?
This is a screenshot from my dashboard:

imagehost.imgcave.com/2018/07/15/properlleer. png

Thanks.