Complicatedly 
The real control of Team Projects lies in the Media Broswer, so you need to have that open.
I also forgot the third, and actually, easiest way to "rename" your project, and it's something I did recently with success, myself.
1) Open the Media Browser
2) Push changes to the cloud so you make a new version. Versions are what gets pushed to Creative Cloud, Auto-Save is the local copy of your Team Project database.
2) The bottom section on the left pane called "Creative Cloud" shows your Team Projects
3) Twirl that down, and twirl down "Team Project Versions" to see all of your Team Projects
4) Right-click your desired project and choose "Team Project Versions"
5) Pick the most recently shared version and choose "Browse."
6) Now right-click on the project again and choose "New Team Project from Version..."
You'll get a dialog box allowing you to pick a new name and the collaborators list will already be populated with the current collaborators.
Clunky? Yes. Relatively simple, though? Also yes.