[SOLVED] Remove Website Box from Comment Form

I would like to remove the website box from the comment form. I have already changed the Leave a Reply to Leave a Comment in the comments.php. I found the area about URL box in the comments.php, but before I start deleting things I wanted to check with you guys. Is there another way to do it in another area? or if I do need to do it in the php file - could you tell me how much I need to delete exactly. Always freaks me out to mess in the php files.
Thanks - grannyc