Actually, I spent a lot of time making that article as non-technical
as possible, while still giving you the information you need to check and fix the problem. If it's over your head, you are going to be in for more trouble later on... technical problems do not get much simpler.
Essentially, it's a script to check your system for whether or not it has the pieces to run Visual Confirmation, and how to fix them if it doesn't. You will have to edit files to put the needed instructions in.
Or you can contact the template author about getting a version that is 2.0.21-compatible, since there are many more changes to templates than just Visual Confirmation over the last 18 months (yes, that's the minimum time your template is "out-of-date").