find this code in your modules -> mod_comprofileronline -> mod_comprofileronline.php file:

[code:1]$query = "SELECT DISTINCT a.username, a.userid, u.name"
."\n FROM #__session AS a, #__users AS u"
."\n WHERE (a.userid = u.id) AND (a.guest = 0) AND "
. ( ( checkJversion() == 1 ) ? "(a.client_id = 0)" : "(NOT ( a.usertype is NULL OR a.usertype = ''))" )
."\n ORDER BY " . ( ( $ueConfig > 2 ) ? "a.username" : "u.name" ) . " ASC";
[/code:1]

and modify to this:

[code:1]$query = "SELECT DISTINCT a.username, a.userid, u.name"
."\n FROM #__session AS a, #__users AS u"
."\n WHERE (a.userid != 62) AND (a.userid = u.id) AND (a.guest = 0) AND "
. ( ( checkJversion() == 1 ) ? "(a.client_id = 0)" : "(NOT ( a.usertype is NULL OR a.usertype = ''))" )
."\n ORDER BY " . ( ( $ueConfig > 2 ) ? "a.username" : "u.name" ) . " ASC";
[/code:1]

this should hide your default superadmin.