NTOPNG where is the "Main" network

[tre4bax]

I am setting up NTOPNG and it looks and works great however It does not appear to see one of my network interfaces.  This is a bit annoying as it is my main wired network.   

My network was originally setup with one Wired network in the router 10.0.0.x on (em2) and wifi was independent just using a port in this network to connect.  The wan is connected to em3.

I created a specific interface for the wireless (em1).   And subsequently created 3 VLANs for various reasons.  I did not move the wired to a separate VLAN though so all wired devices still connect to the same network interface em2

It is this em2 that does not show up, though both em3 and em1 do.   I reason therefore that this is something I am miss configuring but as yet have found no great resource for helping me set it up.   Can anyone tell me where I am going wrong or point me to some step by step configuration advice?