I can't seem to figure out how to put it on vibrate. Its just silent, and flashes a light when I call it. I just got this cell phone today. Neeed some help hereeeeeeeee. I can't find it on the instructions either.

I have 6230i and I think most Nokia menus are the same. Try this.

Go to the Menu->Settings->Tones->Incoming Call Alert-> Off. Now check it by either calling that phone or in the Tones area, try to change the Volume and it'll Vibrate, instead of ringing.