How would I list the signature line exactly if someone has POA for someone else? My fist signature line would be the customer, Managing Member and then he has the POA to sign on behalf of the other member.

For John Smith signing for Mary Smith, we use the following:

Mary Smith by John Smith, POA

thanks for the help

I'm a little confused. Is your borrower an LLC? If so, make sure your POA covers this, too.

Make sure it shouldn't be styled as "attorney in fact."

That's right. A person signing under authority of a POA can do so
as

Mary Jones, by John Jones, Attorney in fact

Mary Jones, by John Jones, under POA

John is not a power of attorney. John is an attorney in fact or agent.

Um, this may be illegal. Here, in the great state of Tennessee, someone signing in a fiduciary capacity cannot delegate that authority to another person. Depending on your state law, a Member may be considered a fiduciary capacity.

Check with an attorney. If that attorney shrugs it off, seems apathetic or ignorant, check with another attorney that wants to maintain a good reputation. I've had to beat up a couple of attorneys about this over the years. Especially title attorneys. They'll let anyone sign anything!