Go to IP > Hotspot > Walled Garden IP List tab. This section configures the Mikrotik to allow the subscriber to signup, pay their bills, and login to the service.
- Add (+ symbol)
- Action > accept
- Set Dst. Host: yourdomain.com
- Add another the same way with Dst Host: portal.yourdomain.com
- Add another the same way with Dst Host: billing.yourdomain.com