[buro9]

Wow, a 2.3.x install?

Erm, check the secret_admirer.php file and find the following:

//
// This is a standard array, seperate the USERGROUP id's with commas... this
// is NOT user id's... these are the id's of the usergroups who you wish to
// exclude from participating in the secret admirer hack.
//
$EXCLUDED_USERGROUPS = array(1,3,4,9);

Remove the ones you want to be able to use it

Note that you should always exclude anonymous users as these would confuse the hell out of the system.

The other groups above were on my board Coppa, Unactivated and Banned.