Wow! Talk about Rapid Response! We came back and checked our email, and there was a note from "E" who said "one end slides through the little opening!"
Sure enough...there is an opening between two layers, and you can insert tab A into slot B and it is perfect.
So, tomorrow when we go walk-about, we will give these a try.
Thank you E! You are a clever lady. Just remember...muzzer ALWAYS needs instructions.
disclaimer: my friend E is not the same person as my sissie E.Rabbit, who is also a very good knitter.