Its a very long philips head screw. You have to drill and countersink a hole in the plate.
Not dificult, just requires a careful "measure twice cut once" approach.
After a while I got fed up with the philips screwdriver, and used a theaded rod with a 10 mm nut on the end. Then I used a 1/4" socket and a speed drive handle.
To be honest, I dont think the incra aluminium plate is thick enough for this approach. It worked in the kreg phenolic plate, but after the second plate warped on me I went to incra and now have a home made dirt cheap lift made out scraps..