Show text in postbit if user profile field is enabled?

Hi,

I have a problem. I want to show a small text in the postbit if the user of this post has enabled a radio button based user profile field.

For example:

I have an additional profile field: Show my secondary usergroup: yes/no

Then the postbit should show a small text, let's say "Premium Member", below the username.

How can I show this text based on the settings every user made in his profile.

Thanks in advance for any help.

rgds,
Roland