Help to create VLAN on AC88U

Hello!

I have an AC88U running the latest Merlin.

Attached to the LAN port I have 7 devices in the following configuration:

LAN port 1 = Device A
LAN port 2 = Device B
LAN port 3 = Device C
LAN port 4 = Device D
LAN port 5 = unused at the moment
LAN port 6 = Device F
LAN port 7 = Device G
LAN port 8 = Device H
Wi-fi 2.4 = Devices Y
Wi-fi 5.0 = Devices Z

I need to configure two separate VLAN so devices on port 6, 7 and 8 are not visible from the rest of the network.

To be more clear I...

Help to create VLAN on AC88U