this is the error i have when i access my page for

this is the error i have when i access my page for the client portal:

Warning: Cannot modify header information - headers already sent by (output started at /home/hdmwtqrx/public_html/wp-content/themes/lounge/page.php:5) in /home/hdmwtqrx/public_html/wp-includes/pluggable.php on line 1121

could you help fixing this