Connect the short white signal cable from the MOSFET to the control board.
The polarity into the control board doesn't matter.
You may find it easier to install by unmounting the control board first, installing the cable and then plugging it into the MOSFET.
Fix the power mount for the heated bed in the same way as before.
Connect the power mounts cables to the MOSFET like shown. Red to positive and black to negative.
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