take 4 pieces fabric and fold it like you see at the picture.
make with these 4 pieces of fabric this form, just fold them over and under each other
sew them together on the line that you can see at the picture, now the 4 pieces are sewed together
take an other pieces of fabric with the same size as the 4 pieces you just sewed together, this becomes the backside of your pouch
sew the 4 pieces (the front side) together with the backside
cut off the remaining fabric alongside the seam
turn the pouch inside out and you're done.
sorry for the bad english and the not bright instructions but it was hard to explain