Nano Button

I wanna build a button for my led strobe light, i have two nano's both with NRF24L01 chips, I want to make one a button and the other to control the on and off function of my strobe light. Can anyone help me? maybe some code or a direction in which i should go about it.

What do you mean "make one a button"? We need more information and a better description of your project.