how can i change my ip on window 7?

hey guys im new here im actually glad that i found this site cuz ive been reading alot of the articles on here and been learning some more but im stuck on my new computer that has window 7 ultimate and im on verizon fios using their wireless westell a90-9100em15 router which is user friendly but ive notice lately when i go 2 try 2 change my ip it stays the same and no im not on static ip. i did read in some thread on this section that if i change the last 2 digits of my mac address it would force my ip 2 change but when i did that i was without net for 7 min b4 i went in and changed back how it was. do i need to wait till it sets itself up or is suppose 2 change and connect right away? anyways sorry for this long post im still a noob and do have a huge passion for learning, thanks in advance!!