I use the following in my template to choose where NOT to show ads
 

  {{if request.module == 'downloads' Or request.module == 'pages' Or request.module == 'blogs'}}

//NO ADS HERE

IS there another thing I can add to this conditional to detect specifically the signup page?

Thank you 🙂

The normal registration page is app=core, module=system, controller=register however there is a quick registration option as well which shows the registration form in a menu when you click to sign up - as that shows up on every single page there's no real way to "detect" that.