locking wireless connection

Here's a newb question..i just bought a wireless router..and i own new macbook, and how do i lock the wirless connection on it? i bought a d-link model # DI-624
just wondering if you guys can walk me through it..

Thanks in advance

Start at this link: http://www.dlink.com/products/support.asp?pid=6&sec=0#manual That's the page that will lead you to the manual for your router. There you'll find step-by-step instructions on how to enable encryption on your router.