GravityForms is not showing up after installation!
If you’ve just installed LifterLMS GravityForms and can’t find the “Forms” links in your admin panel chances are you have not yet installed the actual GravityForms core plugin!
LifterLMS GravityForms adds functionality to LifterLMS which allows it to integrate with GravityForms. It does not add GravityForms to your site.
You can purchase a copy of GravityForms from their website at http://www.gravityforms.com/