Please could you assist urgently.
I have inserted the code as given on the Appointments+ FAQ document to have my users redirected to a thank you page after they have scheduled an appointment (no payment). When I insert the code in the Functions.php sheet and I test the output, a blank page appears with the following message:
Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/themes/themetrust-create/functions.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 1207
Please could you assist urgently in getting this sorted out?