Every device in the world which can connect to a network has a unique identifying address call the MAC address. (This has NOTHING to do with Apple products - although they too will have mac addresses.)
The one for your printer will be on the documentation, and probably on the box.
Most routers have the ability to only allow specified MAC addresses to communicate through the router. If you have not got such filtering enabled in your router then you need do nothing. If you have got mac filtering turned on then you need to type the printer's address into the appropriate page in the router's setup.
There is nothing on the printer to '"disenable".(sic)