Check availability in your account
Custom domains are an optional Pro capability. Open Custom domains first. If the page says self-serve domain adding is not on yet, an operator must wire the hostname for you; do not change DNS until you have the target value.
Point and verify the hostname
When the account provides a CNAME target, create that CNAME with your DNS provider. Return to Whooshly and choose Verify after the record resolves. SSL is issued after the hostname points to the service.
go.yourbrand.com CNAME <target shown in Whooshly>Create links on the domain
After the domain is active, open Links and choose it from Short-link domain before creating the route. Configure a fallback URL for requests that do not match a saved ending.