How do I edit my Forms for the database function when it suddenly disappears?????

How do I edit my Forms for the database function when it suddenly disappears?????

Hi,
 
I apologise for lack of detail I'm new to the world of Zoho and have limited computer skills!
 
I've recently created a database on Zoho Creator using the form to create a user friendly application.  The application is working well but for some reason I am no longer able to edit the original form - it doesn't appear to load it anymore.
 
Does anyone have any suggestions as to how I make it spontaneously reappear?
 
Many thanks in advance!
 
Ben