I finally got it to work, but it certainly wasn't as easy as the first link.
I removed content control from the second box, and I don't know if that is
what I needed to do, but suddenly the Create Text Box Link choice appeared
when r-clicking on that second box which wasn't happening before no matter
where I was pointing at that box. Now this third box is very friendly; it's
allowing me to link to a fourth if I choose without all the hassles that
second box gave me. Thanks for your time.