Admin
The server part is not running at this address, so nothing can be saved. Open this page from your deployed Cloudflare address (it ends with /admin.html).
Log in
A. Upload game zip
The zip must have index.html inside. It is deployed to your Cloudflare project with the zip file name, so use all small letters (for example stick-sniper.zip).
B. Add game by URL
For a game that is already hosted. Paste its link and it appears on your play page.