Thank you for this.
I've done everything you said, except 1 thing.. "create a new file in the public_html folder and name it ".htaccess"."
The reason being, this file already exists on my website, so I added the code snippet the end of the existing file.
The issue I'm having is that it appears to show I'm verified on Damus, but not on snort or primal. Is this just a propagation thing where I have to wait?