Using a custom domain
Go to Publish.
Change URL to Use my own domain.
Enter your domain name exactly as you want it to appear in your URL (either domain.ext or www.domain.ext). The version you don't use will automatically forward to the other; in other words, using domain.ext will automatically redirect www.domain.ext to it (and vice versa).
Scroll down and add the listed host records to your domain (via your registrar or DNS provider). If similar records already exist, remove them first or things might get a little weird.
If you're not entirely sure how to manage your domain's host records, find your domain registrar in the table below to get instructions specific to your registrar:
Note: Be sure to disable any form of redirection, masking, or parking you have turned on for your domain as these may conflict with your host records. Also, be aware host record changes generally take a little while to propagate, so please allow up to 24 hours for them to fully take effect.
Click Publish Changes.
You're done ... almost. Wait a little while and try visiting your site. If all went according to plan, you should now be able to access it using your custom domain (and do so via SSL, courtesy of Let's Encrypt).
