Step 1: Step 1, the base
Step 1. Fold the top-left corner down, as if making a square.
Step 2. Do the same thing on the other top corner.
Step 3.Turn the paper over.
Step 4. Fold the paper horizontally so that the edge of the paper reaches the ends of the creases made in steps 1 & 2.
turn the paper over again and press the middle of the lines and then bring up the corners so it forms something resembling a triangle.
Note: If you're having trouble understanding this, try searching 'waterbomb base' on Google. This base is a bit like that, only it's not square.