I was right! I was right! I was right! I was right!
Wow--talk about a good guess. I'm going to have a sprained shoulder from patting myself on the back.
Okay, I started by opening the form to send LisaSTL a PM. Then, I erased her name, and typed in Moderator. I got a message that I have to name a recipient. Okay, not what I'm looking for.
Then......I typed in 'Forum Moderator' in the space where the name goes.
Here's the error message
"The user you want to send a message to is not approved to use the private message system"
So, the OP got it backwards. I'm sure that it's the same message, but it's actually saying that "Forum Moderator" isn't approved to use the PM system.
I should go and sign up for more MSCs, instead of goofing around here. D)