Go to Admin → Settings → Domain and enter your desired subdomain (e.g. `clients.youragency.com`). Senly then generates a CNAME record that you need to add at your DNS provider.
After adding, verification usually takes 5-15 minutes. Senly automatically arranges a TLS certificate via Railway. Status appears at the bottom: Verifying → Pending → Verified.
Once Verified, your portal opens on your own domain instead of senly.io.