If you followed the instructions on how to connect your own domain but it's still not showing up, there are a few reasons for why it might happen:
1) Not enough time has passed since you changed your DNS settings. It can take up to 6 hours for DNS settings to be changed at certain domain registrars.
2) Your DNS settings are not configured properly. There might be old A or CNAME records you need to delete, or you might have entered the wrong details. Double check that.
3) You entered the wrong domain when you first upgraded your website. If that's the case, go back to the editor and hit 'Publish'. You'll then see the domain we linked this website to and an option to 'Change' it right below. Click it to change to the right domain.