I am trying to make changes to a form that I already created but it won't save.

Hello nedahaghighi,

I'm sorry for the trouble caused to you.

With which form you are having this issue with? I did check your last edited form "Helen Beshan - Homefront Pioneer" and did not find any issue with that. I was able to make changes in form and save it successfully. Please check the screenshot below:

The issue you are having could be a browser related issue. I would suggest you to clear your browser cache and try again to edit your form. The following guide should help you :  http://www.wikihow.com/Clear-Your-Browser's-Cache 

Do get back to us if the issue persists.

Thank you!