where do i add it here is my function.php    <br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/eliteacademicess/public_html/wp-content/themes/zzero/functions.php:1) in <b>/home/eliteacademicess/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1893</b><br />
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