how to use custom field at the member area

[Sarcoth]

From my experience with the memberinfo stuff, you are going to need to use $userinfo instead of $post.

Also, I don't see you registering any of your variables so I'm not sure you'll get anywhere with that. I recommend reading over the Rending Templates article again and looking over the preregister part of it. I haven't done it before though, so I'm not exactly sure what to do on that.