Commenters website link

If you go to my site (http://purrfection.sugar-melody.net) and click on my comments and you read other peoples comments you can see there comment, their name e-mail, and then the name of the author of the post they commented on. But I don’t need it to say who the author of the original post was, since I’m the only one who’ll be posting. Instead I want it to have a link to the commenters website (if they have one), but I don’t know what the like php insert code thingy should be. So could someone please tell me? Thank you!!