Renderman is one of the plugins of Maya.
It follows the rules that every other plugin of Maya has. Be more aware of the relevant versions of it. Please refer to" Maya clients desktop manual" and "Maya website manual" for more details.
Here is the instructions of setting a rendermen plug for maya users:
Select a project＞Pick your Maya version＞Pick your plugin version＞Add＞Save
Website: Renderman for maya setting：
Select your Maya version＞Choose Plugin version＞Add＞Confirm