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Well if you mean the title screen that says Final Fantasy III, unfortunately that one can't be edited - it's compressed
BUT you can make an awesome title screen picture before that sequence..Here's a really awesome video to help you:
http://www.youtube.com/watch?v=29q6SY9XAyU
Do everything Zeemis says and it'll work.
Be sure your ROM is named Tests.smc whenever you get to that one step. But a good precaution is to just go ahead and name it that. After you get done with the entire tutorial, you can go ahead an name it whatever :p
Hope it helps!
Oh and seeing as your starting today, be sure to make lots of backups!
EDIT:
Be sure to download all the files in his description, too.