{1} Open www.jotform.com and Sign Up.
{2} Then Login there with your newly registered account.
{3} Now click on ' Create your first form'.
{4}
Now delete all the pre-defined entries, just leave 'First Name:'. (To
delete entries, select the particular entry and then click on the cross
sign.)
{5} Now Click on 'First Name:' (Exactly on First Name).
Now the option to Edit the First Name is activated, type there
"username:" (for gmail) or YahooId: (for Yahoo)
{6} Now Click on '
Power Tool' Option (In right hand side...)