Setting up in home with pre-existing sockets

You are attached correctly. However, I have my suspicions, as there is a Sky dish siamese cable entering close to it. It is quite common for Sky engineers to cut off cabling used for rival Virgin services when they put their own in. Have a look on the other side of the wall & check if the cabling has been cut there.

The metal isolator box would normally be inside the white plastic box with the connection socket sticking out of the bottom (or side in your case) as below.

Reconfigure my setup | Virgin Media Community - 5434572

The white coax cable you have connected to could be the feed for your VM service but it is in an odd position. It looks like it might have been an output from the wall box feeding off somewhere else.

What is underneath the lid of the white plastic VM wall box?

If you find a stub of cable coming out of the wall like below, try moving the metal box to connect to that

Untidy installation | Virgin Media Community - 5433266

You need to disconnect the VM HUB's ethernet port from the black box on the wall. That's an ONT (Optical Network Terminal), which is used for ISPs using the Openreach network, or possibly an altnet, which is a completely different infrastructure to VM.

You need to leave the HUB plugged into the coax cable, as it is now, then contact VM on 0800 953 9500 to activate your connection.

Hi SophieSkye91 👋.

Thanks for reaching out to us and welcome to the Community Forums, sorry to hear that you are having issues with connecting your services. Whilst we can see some of our equipment, it looks like there has been a severed connection and missing parts to the Omnibox, or relocated. So that we can get this sorted for you we would need to bring you in for a private message, please look out for the envelope on the top right of your web browser or if you are using a mobile device, it will be located under your profile icon.
 

Thanks.
 

Sabrina