Even though the actual application process is not long or strenuous, there is a bit of a science to it. To keep this in Layman’s terms, you need to apply the tape in the area that you need to be supported. When doing so, though, your muscles need to be in a stretched position and not slouched. Part of the reason you want to do it this way is to prevent any stretching of the tape itself.
However, the process is also reversed depending on if you need the material for support or rehabilitation. For the former, apply it from the origin to the insertion of the muscle and for the latter, do so the other way around.