"""I wanted to let you know that you forgot to sign the label for Margaret's center. Sorry to be the bearer of bad news- don't know how to resolve this, maybe the group will have some suggestions. I will leave your line blank and sign beneath it."""
Just an idea!
1. You could have the the person with the center just fill your info for you!
2. Or you could pay for the shipping and have it (just the label) sent to you, fill it out and send it back!
Good luck!!