For this example we are going to create a VLAN with ports 1-10. Port 10 is going to be a tagged port and 1-9 is going to be untagged.

Click Bridge > VLAN > Tagged VLAN. Input the VLAN ID and the VLAN Name under Tagged VLAN Settings. Under Static Tagged select port 10. Under Static Untagged select ports 1-9 then click Apply.