Can you show me how to single crochet around post of last double crochet?

for back post single crochet - insert hook from back to front around post of next stitch, yarn over and pull up a loop even with last stitch worked and complete single crochet

for front post single crochet - insert hook from front to back around post of next stitch, yarn over and pull up a loop even with last stitch worked, and complete single crochet

This is easier explained in photographs or video.