[Logician]

if it's an already existing field which kept in $bbuserinfo[xx] variable then you simply add this to your template and it will show up. This will work for user profile fields for instance..

If it does not reside in this variable then you need to write a hack, create a variable that will keep your data, put that variable in your templates and write codes to get/put data from/to your database and variable. Not so simple in another words..