Do one of the following:
1) Use whatever key you use for sheathe weapon(? whatever key R used to do)
2) Reset custom key bindings
3) Live with it until 3.0 is released
Basically, the vanilla bottom bar doesn't update the button art to reflect key binds. So if you rebind R, T or E etc.. it doesn't show that you've done it. So it tells you to press R when it should be telling you to press some other key.
SkyUI 3.0 fixes this but I'd wait until we release a final version before using it (unless you're making a mod that uses MCM) because it's still somewhat in the works
