I'm trying to increase conversion on the comments on my showcase articles. I'm thinking I need a login link where is says "To post comments, simply sign up and become a member!". What file can I add that in?
You should be able to use the temlplate code from one of the core xenforo login forms. Might need to do a bit of tweaking and add your own CSS, but I can't see it being that difficult of a customization.