Transmission problem

[Poodle]

Don't mean to be harsh, but if you don't know what you're doing you're best off leaving it well alone, or at the very least having a read around about what the problem might be before just doing what seems like a good idea. Had a corsa in a while back whose owner had taken the same approach as you to the engine oil, needless to say it was ruined and cost him about £600 to fix.