Pull the cable tight at the derailleur.
Rapid Rise Derailluer wants to go the the big granny gear in back with no cable tension
Regular rise wants to go to the small fast ring in back.
You'll want to make sure you tighten the cable at the derailleur with the shifter matching your derailluer's natural spot, large or small cog in back. Also a good idea to screw in the adjustment knob most of the way in on the shifter to allow room to adjust cable tension, typically a little loose right off the bat.