Oh i see what your asking lol, i think you're actually asking a technical question? Are you wondering what those corner tags are and why they are sticking out? Thats just the extra seam allowance from your other triangles. Ok, make your corner triangles, if you don't know what size to make them, then just make them extra big, and you can trim after. Lay the gold edge against the black edge and do your seam, them press it forward, then if the triangle is too big, you just square it up and trim it, does that make sense? If you want to trim those gold tags ahead of time, lay your ruler right on the edge of the black sashing, and trim.