here are the final steps for the welt pocket with flap. The other parts can be found here: part1, part2, part3
now I placed one of the pocket parts on the wrong side of the pocket
and pinned it to that seam allowance I sewed the flap to
now I folded it up
and then pinned the other pocket part to the lower strips seam allowance (medium blue)sewed
then I ironed it down and sewed on the seam allowance to keep it that way
then I folded the other pocket part back down as well
and pinned both pocket parts together
and sewed all around
next I cut the fabric close to the seam, if you do not have a lining where you are putting your pockets, you should serge the open edges of the pocket parts before sewing
now I undid my stitching that kept the pocket closed.
well I hope this was helpful for you! Let me know if there are any questions left!
keep sewing and smiling