Fetching data for a form

Fetching data for a form

I am new to zoho, I have imported data and made a form from that data.
I am unable to get the field boxes on my form to formulate anything example:
(fetch info for other fields if name is equal) 
and if I use the form, then it does not update the spreadsheet that I imported.
Could someone help me understand please.
If I have to make "another" form to use the database (which works) then it is not useful.
Yes I have watched all the videos and nothing deals with this.
the written guides make no sense at all (sorry)