Fold as shown, stand up, fold as shown, (two blocks), fold up.

Fold to the middle, open, fold inward along the crease, flatten

Fold up, open, push up along the crease, flatten

Fold up, fold in the middle, and put the enclosed sharp corners in the middle.

Seen from below, the sharp corner is folded down into the middle, the left side is folded up, and the right side is folded down.

As shown in the figure, the unit has been completed. Grab it, press it, splice it, plug it in.