List of Project Plan Templates in PWA

I have created a bunch of Project Templates and would like to get rid of some that I don’t need, or write over some that I need to change. When I open up Project professional and connect to my account on my PWA, I can click open and connect to my PWA and I see a list of all my projects on PWA, great. Now I change to Project Templates, but the list doesn’t then change, and I still don’t see the list of existing templates. The only place I can seem to find the list of templates is by going into PWA/Server Settings/Enterprise Project Types/Choosing an existing Project Type and then clicking the drop down for Project Plan Template. How do I delete existing Project Plan Templates?