First of all, welcome!
We however do not allow account sharing due to the risks it brings when someone gets involved in a dispute.
Or when they get banned and the other guy might want to come back. You see, it only makes things more difficult for all the parties involved.
What I suggest is that you both create seperate accounts and post on the forums from your home ips, I don't know why you would want to be active on the forums via a vps anyway, there's no point in that unless you are ban evading.