Hi Misszell
Not knowing what phone you have. Simply use the web to search for, "how to wipe cache partition on (your phone here). You should be able to find the how-to.
"most times".....you just hold the, VOLUME UP, HOME AND SLEEP/WAKE BUTTON simultaneously, till you see the the phone's green android guy, and it will say something to the affect that the phone is installing update (its not)...then it'll go into recovery screen, where you'll use the volume and and down keys to select the, "wipe cache partition" option, the select reboot.
Hope this helps!
Chris