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Editing and saving works as intended when I checked it on my end.
I would recommend you give it another try, only this time, try the following suggestions:
1. In case you're using a different browser, use Chrome.
2. If you're currently logged in, logout of your account > log back in > then try editing your form.
3. If all of the above won't suffice, clear your browser's cache and cookies.
Related guide: How-to-Save-a-Form
If you're still having issues editing/saving your form, give us a screenshot of how it looks like from your end, here's how.