I have a domain and one subdomain. The domain has a installed SSL with valid certificate but the subdoamin doesn’t have it. I have a link from domain’s wordpress header.php file that pointing main page in subdomain. The link supposed to be as HTTP but it was changed to HTTPS. I edit header.php file but after update the file it changed to HTTPS again.
I installed WordPress HTTPS plugin in domain wordpress.
What I have done:
The domain wordpress is located in Domain/app which I copy the files and folders to root directory (Public_Html) a by Godaddy technician’s suggestion (my domain is from Godaddy).
The subdomain wordpress is a clone from the main wordpress.

Please let me know how to change this link to HTTP. I appreciate it in advance for your help.