Thanks for your post and welcome to the forums. It's great having you on board with us.
You'll be able to upgrade your account by going to the upgrade section of My Virgin Media. Be careful though as if you have any current discount, it may cost more than what you'd think.
Your best bet is speaking to the team on 150 / 0345 454 1111 for them to go through things with you.
Keep us posted on how you get on.
Tech fan? Have you read our Digital life blog yet? Check it out