Per ticket 321930, it is not possible to edit the Welcome letter sent to contacts.
This is a problem. The default message looks like a phishing scam. I need to be able to customize the welcome so that the recipient knows that it came from our association and why he or she would want to join the Arbiter system.
We have a very low acceptance rate (< 10%) on our invitations to coaches and athletic directors, and having seen the welcome letter I can guess why.