The next step is to cut the corner squares into 3 equal parts as shown, cutting from to the center score line. For the center squares ib the top and bottom, find the center and make a mark. Then cut from that center line to the score lines. You will end up with a triangle shape as shown.
Cut off the tips of the inner two strips as shown.
You then need to fold the basket up as shown, layering the strips on top of each other until they look like this. You can then ad some glue or staple them into place. Cut the little tip off the triangle that is above the basket sides.
I hope you like this little basket as much as I do.