Unscrew your front sling screw and mount the adapter with the screw provide in the same hole. Use the rubber sticky tabs on point of high contact to minimize marks on your stock from the adapter. It is a little tricky to slide the adapter mounts in from each side to keep everything centered and straight with the stock. First time I mounted mine if had very poor tracking on my rest. After close inspection I realized I had it running parallel to the taper of one side of the stock and the entire adapter was not straight. Live and learn. Bulky, but works well.
Luck, Tim