How do you add a mouse to a computer?
It depends if it is wireless or with a cord.
If it has a cord, simply plug it into the computer using a usb
plug on the back of the computer.
If it is wireless, turn off the computer, turn off the mouse,
turn the computer on, wait for the computer to ask for a mouse,
then turn on the mouse, and the computer should pick it up within a
minute or so.