SIMPLE STEPS HOW TO WORK A BACK POST TREBLE STITCH
1 Identify the post of the next stitch. Then work yrh (as usual for a treble stitch) and insert hook into the back of the fabric, around the front of the post, and bring out hook on other side of post.
2 Work the rest of the stitch as you usually would for a treble, so yrh and carefully pull the loop of yarn out of the fabric – it should loop around the post of the stitch.
3 Work yrh again and pull the yarn through the first 2 loops. Yrh and pull the yarn through the remaining 2 loops to complete the front post treble stitch.
4 You’ll see how the stitch is set back, compared to the rest of the fabric. Work more back post treble stitches in the same way, repeating from Step 1.