You can't delete it because it was used in a flash. Maybe you should contact that guy if you want to take the song down.
Also, I assume you've already figured this out by now, but that's not a remix. In fact, it's more like stealing. You made some minor changes to the FLP, which doesn't give you the right to put your name on it. Remixes should be made from scratch, with at MOST a midi file to get the notes right.
devilsgarage
Nice!
MuzikProd
Nice what? that im deleting things?