Two NTL boxes are shown in message #4 below. The one on the LHS is a phone socket. The one on the RHS is a coax connection for broadband/TV.
https://community.virginmedia.com/t5/QuickStart-set-up-and/No-Virgin-Media-Socket/td-p/4854895
The old-style coax plugs had to screw onto the RHS wall box connector. The new ones are push fit.
If you are still unsure what to do, post up some photos of the box you are trying to connect to.
If the existing box is in an unsuitable location, you will need to phone in for a technician installation to move it (which should be FOC to a 'Quick Start' customer as part of the initial setup).