Here are the instructions to make an origami menko:
Start with two square papers, and colored side facing down. Here I am using printer paper.
1. Apply a horizontal “Z-fold” (valley fold the top, mountain fold the bottom each 1/3) and unfold.
2. Apply two horizontal folds. Notice in the picture that the top one is folded first, followed by the bottom.
3. Apply two valley folds so that it matches the picture below.
4. Rotate one paper 90˚.