(See also Setting up Fydelia HotSpot on your MikroTik Routerboard)

To create a HotSpot on a VLAN, follow these steps:

From the left menu click BRIDGE

Add a new bridge.  We’ll call this “FODBridge”:

Click Apply and OK

Click the PORTS tab

Add a new port:

Assign your desired VLAN (vlan 10 in this case) to the bridge you created in the previous step

Click Apply and OK

This means that, during your HotSpot setup, you can select “bridge-hotspot” as the interface: