If its not electric it should have a screw and mounting plate that goes on the back of the board in the middle not top should have a mark on it. but there should have had 3 plastic stopper looking pieces that go on the outside edges on the back and what you do is adjust the screw until the board fits snug to the wall
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If its not electric it should have a screw and mounting plate that goes on the back of the board in the middle not top should have a mark on it. but there should have had 3 plastic stopper looking pieces that go on the outside edges on the back and what you do is adjust the screw until the board fits snug to the wall