Custom Signup Form For ProSites

Hi there,

I just installed the ProSites plugin installed along with visual composer. I created custom pricing plans using a visual composer addon and pointed each buttons to the specific URL that the prosites plugin generated.

Now I would like to know how I can create or embed a custom form so that once the user selects such button it will load the signup page where he/she can enter their info such as username, email, password, etc..

How is this done?

Thank you,