what is your tablet OS?
and what is the make/model of the printer?
to setup the printer wirelessly, it needs only to be within range of the router.
and as Cameron states, you set it up from the LCD screen, plugging in the right password for your wifi network.
another option to consider, if it's only the tablet you need to print from wirelessly, the printer may have it's own wifi direct network you could use to send prints straight from your tablet.