Please help ASAP 
Hi @doggogqgqgqgqgqgqgqgqgqg, welcome to the GitHub Support Community!
I don’t see this subdomain home.upbeatisdown.tk attached to any of your repositories. Did you instead mean just upbeatisdown.tk, or are you specifically adding that subdomain home?
If you are trying to add the subdomain home, taking a look at that subdomain’s DNS settings it looks like it’s not currently set up to point towards GitHub:
In order for this url home.upbeatisdown.tk to point towards GitHub’s servers you’ll need to log in to your DNS provider and create a CNAME record for the home subdomain that points towards your GitHub address doggogqgqgqgqgqgqgqgqgqg.github.io.
You’ll then need to make sure you add the custom domain home.upbeatisdown.tk to one of your Pages sites in the repository settings.