I have always found it easier to just use the existing $template_hooks in the template and write a plugin to add these. In this case, there is a $template_hook right where we want it, after the user post count:

Code:

---

{vb:raw template_hook.postbit_userinfo_right_after_posts}

---

So, we would create a plugin with these specifications:
? hook location - postbit_display_complete
? Title - Add User Profile Fields to Postbit Templates
? Plugin is Active - Yes
? Plugin PHP Code -

Code:

---

if ($post['fieldx'])
{
    $template_hook['postbit_userinfo_right_after_posts'] .= '<dt>My FieldX</dt> <dd>' .$post[fieldx]. '</dd>';
}

---

Change "fieldx" to your actual field name and the green field to whatever you want. Again, notice the html I used is similar to the html used for the text above me new field. Whichever template_hook you use, you should look at the template to see what sort of html is being used around the hook so that you may use similar, proper html also.