BuddyPress.org

I want to create a custom text field which is specific to each user and which can only be changed or edited by the admin.

I want this field to be located at the top of the user profile so they can see the notes or message from the admin each time they login.

I know this is probably a simple plug in or alteration, but i am totally clueless in this instance and would greatly appreciate any help. I am using my buddypress as a very simple project management tool and this is the last step I need to make it work perfectly.

thanks
Adam