Originally Posted by slhager
Where I'm off is the lower corner of the dark green. Where the long dark green meets up with the dark green corner.
That corner is where you need to place the straight pin, and then the two securing pins.
Looks like you need to "ease" in the longer piece. Keeping it on the bottom will help a little.
It would also help to sew from the top of that corner -- less sewing before you get to the crucial corner. You still need to pin the other end and "ease" in the longer piece to have everything work out.