By what he says, If people would actually read through a post (not just the Title), He is talking about the avatar. He is trying to use the wrong feature. Go to your user CP, And editing your avatar is the first choice in the 3rd Section down. It will prompt you though to upload a picture off your computer. The avatar is the picture below you name in every post, as you explained. In my case it is the red spinning skull.
The "profile pic" option is for putting a picture in your profile page only. And disabled for the moment as we work out kinks.
If you want to display a signature picture (thats the one you see in my post of my car) you have to get get a photobucket account and place a "image Tag" in the signature area. Our Forum has grown to a size and levels of membership that the signature picture function is disabled. It cant be formatted to the number of levels we have, and to expensive to host all the pictures that show in every thread.
For signature pics, Start a photobucket account, upload signature pics 100x500 pixels max (in your case as a regular member) to it, "copy" the tag shown for "IMG for bulletin boards & forums" and paste it into the "Edit Signature" box. This is in the option just below "avatar" in your user CP.