Hey SteveD, glad to hear you found my video helpful! That's always good news.
When you get back to where you started, just work a slip stitch into the first stitch of the round (or whatever stitch will give you a smooth ending to the round), cut your yarn leaving about a 10 inch tail to weave in later, pull that tail all the way through the loop on your hook and tighten up the loop to secure the yarn. Then weave the tail in to hide it.
I hope this is helpful. If not, perhaps it's time for another video!