Reaper and Addictive Drums

I've been using Reaper for a while and like it more and more, but I can't get my new Addictive Drums plug in to load. I'm sure there must be a way to do it - can anyone help please? I don't want to go back to Cubase! Cheers

It fails to load or you can't find it in the FX window? If you can't find it, check what stupeT said. If still not showing up, try cleaning the FX cache and re-scanning the directory, also in VST preferences. I have AD here and it work flawless with RPR. Fergo

Works here too.

reaper and AD 

Solved. Thank for the help guys