Hi Paul and Welcome to Muvipix!
Everything is under the Disc Menus tab. Once you've created your video just go to the Disc Menus, select the category that you want to see (Entertainment, General, Happy Birthday, etc.) and then select the specific one you want. Click on it and drag it into the pane where it says "To add menu drag Template here. If there are no templates at all under Disc Menus then something didn't get installed correctly and I would suggest reinstalling PrEl 7 and making sure that you install all options. This won't affect any projects you've already created.