How to fill in an automatically selected element.

Please explain a little bit more, what do you mean field is already selected? You can use the fill function on any field, independently where the actual focus is. You mean rather the field is "disabled"?

Also might be careful. Many services gmail, hotmail and most other related sites if you read the end user license agreement many simply click past and ignore will say "using automation to automate out site is not allowed without permission", Might many sites can pick up if you are and will start restricting access if not disabling your account...