I can't unlock the blade.
Do you mean the chain won't move, or you can't get the blade off? The chain brake must be off to allow the chain to move. The chain brake handle has a housing that engages a gear attached to the chain brake inside the cover where the blade is attached. The brake must be off to remove the cover (usually held on by two nuts). The blade tension screw should be loosened to allow the blade to be removed, then retightened when replacing the blade. Tightening it pushes the blade out from the saw, so if it is tight, you won't be able to remove the blade. Hope this helps.
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