I have my wan port configured to connect to my modem

Ports:
cable to managed switch in another room
short cable to old home router running openWRT to be access point
I am still figuring out how to do the ssid to vlan mapping in openwrt

in openwrt I am going to setup 3 SSID's
one for IOT one for my and a guest one

I went to the vlans tag and added the 3 vlans to both ports
all the vlan interfaces show up as avaiable network ports

now what do I do in the interfaces tab?