Yep, I didn't understand it, but. In my defense, I read the login instructions very carefully and this was imprinted on my mind (esp. the "if this is your first time logging in".)
" If this is your first time logging in, or if you forgot your password, just select your name / username above, then click Authenticate / Login below without entering a password. A link will be e-mailed to you to set your password."
for us old timers, we didn't go through this, or it was so long ago we've forgotten, or we were kind of clueless then

Adding people is relatively recent for me. Most (almost all) get through it with no problem so all we do is add the new people to the site and we don't pay any attention to the process.
After this, I expect I'll know what to do, and I do greatly appreciate your help.