How to use Form Templates for InfoPath Forms Services inside Project Server 2010/SharePoint 2010 Web Application

1- After you deploy your InfoPath form, you should see this screen form Central Administration -> General Application Settings -> Manage Form Templates
(then install it and you can enable it from your Site Collection Features as well)

3- So, you need to create new Form Library that will use InfoPath Form Template:

4- From Library Settings, Advanced Settings, Set Allow management of content types equal True

5- then add your Forms Services to form content and make it the default - Add Content Type and select your InfoPath Form Template:

6- Finally, you have a form library of content InfoPath Forms Services: