First, you fold the paper so that the top right corner touches the left side like this.

Next, you fold the point at the top to meet the right point like this.

Now, you fold both underflaps like this.

Then, fold it up as shown.

Next, fold the triangle in half.

Now, bring the right point down like this.

Then, roll it up as shown.

Last, tuck it in.

Here is the finished product.