|Read the manual that came with the unit. It should detail the process and if there's a physical on/off switch for the wireless, show you where it is too.|
If your manual doesn't detail this information, then I'd suggest taking your unit back and buying one that actually comes with a useful manual.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.