To clarify, there are two different aspects of "change" in the example you showed. One is that the bureaucrat and admin tags have a color. Local admins (which you are) can do that using the site CSS. The second aspect is the custom tags such as "CSS-3". Those need to be added using the script PrimarinaPlays linked to. If you don't mind me asking, where did you get the example image from? That looks to be a legacy wiki but I thought there were only a few of those left.