First you want to remove the relays associated with these white connectors, then unscrew the two hold down screws at the corners top side on the block (they usually have a black plastic head on a metal threaded body). A 90 degree tipped pick is best to use to push in the tabs on the white connectors from the underside after lifting out the block. Also there are two 10mm bolts that need to be removed in the front lower area of the Power Distribution Block(Power in red cables).