NuclioN, in the admin/functions.php file, copy the birthday code and the zodiac code (below it) AFTER the following code and put the same variables you are using in the profile where you want them to show up in the postbit. That should do it.
PHP Code:
if ($post['receivepm'] and $enablepms==1) {
eval("\$post[pmlink] = \"".gettemplate("postbit_sendpm")."\";");
} else {
$post[pmlink] = "";
}