While it's strongly advised to maintain an active SSL certificate on your websites, there might be situations where you need to uninstall the certificate, for instance, when installing a custom SSL certificate.
To temporarily disable HTTPS and make your website accessible via HTTP, you can unforce HTTPS instead.
To uninstall a certificate, go to Websites → Manage, search for SSL on the sidebar, and click on it:
There, locate the SSL for the domain (or subdomain) you wish to remove, click on the options button ( ⋮ ), and select Uninstall:
After uninstalling, your domain will appear on the list to install a new SSL, and your website will only be accessible via HTTP.
NOTE
Attempting to load a website without SSL using HTTPS will result in an error