ok if you dont have a network printer (the price tag would have shown you...) then you have basically 2 options
1. on the pc to which the printer is physically attatched, share the printer on your network. The only disadvantage of this is that the pc with it connected must be turned on (not necesserally logged on) for others to print.
2. Buy a print server
3. take printer back and buy a proper network printer
ok thats 3 lol, option3 is best but also most expensive