Add manual light switch to Genie Garage door opener
Lights on garage door openers are normally controlled by a proprietary wall console like this:



Genie Wall Console (I have no idea if this is the one you really need, just an example)

They use the same two wires as the pushbutton does, but send special signals for other features such as the light and lock functions.  The wall console wires might even need to go to different terminals on the opener depending on brand.

So, if the question is "can I wire up a regular light switch to control the opener light", the answer is no, but you can probably make it work with the right accessories.