How exactly can we help you at this point?
A word of advice, the directions you linked above are written for someone with a skill-set above the beginner level. I read thru, there are a few steps listed where they tell you what to do and not necessarily exactly what to type.
I looked at your community, you’ve done a nice job with it. At your current levels of activity why are you wanting to move to a VPS hosted solution? The managed cloud solution that you are currently using is a pretty good solution for small communities.