Toasters

I really like this mod but am having an issue. I am kind of new to KSP and very new to mods for it. I am probably missing something really simple about the LEM... I have launched a Saturn V, docked the CSM with the LEM, transferred crew, made it to the mun, and undocked to prepare to land. However I cannot get the RCS to work on it (yes I pressed R; it is enabled). Any help?