Hi, putting the Herbag together is easy:
You have the big flab with the big hole. The big hole points to the front. Then you have the two handles and the strap. The strap is on the outside of the handles, so it goes: strap, outer handle, inner handle ________ (leather part) inner handle, outer handle, strap. Lay the flap out in this position and then just push the rod through, tie the screw, that's it. The cadena (lock) goes on the backside of the bag where the little hook is. If you want, you can hook it also into the whole of the leather strap in the front, but it is not so practical.
hth!