Sorry, not clear what you're asking.
To apply a stroke to a solid, draw a mask path, then apply the Generate/Stroke effect.
Please provide an exact description of what you are trying to do. Your question isn't even vague, it's just incomprehensible mumbling. You could be referring to mask strokes as Andrew was guessing, shape layer strokes, layer styles or some specific effect, but it is absolutely unclear at this point what you actually mean.
The video that you link to seems to go through all of the steps and show pretty clearly how to accomplish the result that is being demonstrated in the video. If you have any questions, perhaps you should ask in the comments on that video. I saw that someone else asked much the same question that you did, and the tutorial author explained that he drew masks on two different layers and applied the Trapcode 3D Stroke effect to each.
Because you are so new to After Effects, I strongly recommend that you start here: