profile fields in postbit
 

For some reason I can't get it to work. How do I put extra fields in the postbit area. Where members can edit them via their settings 'edit of their profile' and then the information appears under their current posts and join date information on their post bit?

You should be able to edit your postbit or postbit_legacy template and insert {vb:raw post.fieldX} where you want it (change X to the field number, of course).

See this -
Using your User Profile Fields in your postbit templates (w/ all plugin method)