Once you release your hand from the piece, you are no longer allowed to change your move (unless you have made an illegal move, then you are required to make a different move after your clock has been penalized). If you don't hit your clock immediately after releasing the piece, then you're just wasting your time.
Can I change my move before pressing the clock?
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Touch move rule states that I need to move the piece once I touch it. But once I make a move (released the piece on a square), can I change the move (by moving the same piece to a different square) before pressing the clock?