I recently purchased a Manfrotto tripod with tripod head. I'm not sure if it's me or not, but I'm unable to unscrew the head from the top of the tripod. I keep unscrewing it and it never comes out. Am I doing something wrong?
Here's a picture of the underside of that plate on my 055XPROB connected to an 804RC2 3-way head -
You can see a slot headed screw thread here and there are 2 more that need to be slackened to release the head (in this case an 804RC2). Also when you unscrew it you may need to turn the silver plates, not the top of the head.
There are three small set screws recessed in the bottom of the plate at the top of your tripod. You must back them off enough to allow the base of the ball head to be rotated. Be sure the middle shaft of the tripod is tightened or you might be rotating the entire shaft. And grip the base of the ball head below the "ball".