Not able to edit existing form

When selecting edit form, the screen just goes blank and never populates the screen for editing.

I have just checked the form you shared while logged into your account and it worked on my end, please see this screenshot: 

I would recommend you to do the following: 

1. Try clearing your browser's cache: https://kb.iu.edu/d/ahic 

If clearing the cache does not work, then try this: 

2. Use a different browser or internet connection, that will help to know if the problem is related to the browser or connection. 

3. Try also using a different device and/or network. 

Please let us know how it goes.