[snakes1100]

AdminCP -> Styles & Templates->Style Manger -> Modify -> [expand list] -> Postbit Templates -> [expand] -> postbit -> [edit]

You will see the 'registered' and 'location' parts towards the top of this template.

Just add
<vb:if condition="$post['fieldX']"><dt>Field Name</dt> <dd>{vb:raw post.fieldX}</dd></vb:if>

after

<vb:if condition="$post['field2']"><dt>{vb:rawphrase location_perm}</dt> <dd>{vb:raw post.field2}</dd></vb:if>

where Field Name is your field name & X is the number of the custom field, to find out the custom field numbers go to:

Admin CP -> User Profile Fields -> Modify

Mouse-over the [edit] links for each field, the number is at the end of the url that shows in the bottom of your browser window.