Creating a branded link
Pick your verified domain when creating the link.
Once a domain shows Verified, create a link as usual and pick it from the Domain field. The rest of the flow - custom slug, tracking settings - works exactly the same.
Most of the time you don't need to: the first option, (default), already shows your link on your default domain and keeps it working on golo.to too. Pick a specific domain only when a link should live on that domain alone.
The same Domain field appears everywhere you choose one - short URLs, Smart Pick pages and your Bio Page settings - with the same options.
Related articles
Adding a custom domain - Type it into Settings - then complete DNS setup and verification.
Choosing a custom slug - One slug, one link - across golo.to and your own domains.
Connecting a custom domain - Add your domain and verify it with DNS records.
DNS setup - One TXT record to prove ownership, one A or CNAME record to route traffic.