In update.php, line 145, add a new function to get the season ID based on the conference ID:

function getseasonid($conferenceid) {
    $query = 'SELECT season FROM sportsdb_conferences WHERE confid = ' . $conferenceid . ' LIMIT 1';

    $result = mysql_query($query) or die("Error in query: $query");

    $seasonid = mysql_result($result, 0);    

    // Return the season ID
    return intval($seasonid);
}

In admin_files/addscore.php, line 79, replace the query and add a line to fetch the season ID:

$seasonid = getseasonid($confid);
$query="SELECT sportsdb_teams.teamname, sportsdb_teams.teamid, sportsdb_divs.divname
            FROM sportsdb_teams
            LEFT JOIN sportsdb_divs ON sportsdb_teams.teamdiv = sportsdb_divs.divid
            LEFT JOIN sportsdb_conferences ON sportsdb_divs.conference = sportsdb_conferences.confid
            WHERE (sportsdb_teams.active =1 AND sportsdb_conferences.season = $seasonid)
            OR sportsdb_teams.teamid = -1
            ORDER BY conforder ASC, divorder ASC, teamname ASC";

In admin_files/editscore.php, line 203, replace the query and add a line to fetch the season ID:

$seasonid = getseasonid($confid);
$query2="SELECT sportsdb_teams.teamname, sportsdb_teams.teamid, sportsdb_divs.divname
            FROM sportsdb_teams
            LEFT JOIN sportsdb_divs ON sportsdb_teams.teamdiv = sportsdb_divs.divid
            LEFT JOIN sportsdb_conferences ON sportsdb_divs.conference = sportsdb_conferences.confid
            WHERE (sportsdb_teams.active =1 AND sportsdb_conferences.season = $seasonid)
            OR sportsdb_teams.teamid = -1
            ORDER BY conforder ASC, divorder ASC, teamname ASC";