Step 5: Assembling (Popout)
Start off easy by attaching the arm. Line up the position as to where it goes (it overlaps where the red ends, a bit) before you start putting tape on it. Get a piece of tape and place it on the white part of the arm. Trim off the excess, then attach it to the main card.
The popout box needs a piece of tape covering the bottom of the rightmost fold, and the top of the leftmost fold. It is oriented the same way on the card as the previous step. Attach the popout box to the card (DO NOT attach it to the arm yet).
Press down the popout box flat, so the folds engage. Hold the arm to the left side of the card (with the box still flat), and slowly close the card. Press firmly where popout box is, to affix it to the arm.
It should be fully assembled now!