I looked at the photos on the other thread. I could not access the directions.
There are 4 equal ovals of fabric 1, 2, 3, 4. Each have a left hand side & a right hand side.
You sew
1R to 2L
2R to 3L
3R to 4L
4R to 1L
So, that is halfway around, 4 times. Follow the directions for turning.
Easier, maybe sew halfway around 1 and 2
half way around 3 and 4
open the unsewed sides of both, attach 1 to 4 and 2 to 3.