A quick guide on changing specifications of VMs in proxmox.

Firstly you will want to create a SSH proxy by running

you@hostname - ssh -D 7777 username@tardisproject.uk

Secondly, you will want to change your browsers' proxy settings to use a SOCKS5 proxy on 127.0.0.1:7777 (provided that you have chosen that port. Thirdly, you will want to log onto the proxmox webpage and do the following:

Click on Virtual Machine
Click on “Hardware”
Click on “Edit” or “Disk Action” if increasing storage.

And restart the machine and all should be good!