In 1984, your email address was a series of numbers and letters. In this case, Database's email address was "7776a."
The message reads: "Best wishes to all the Database Team. Electronically yours, The Green Family."
Beep beep boop, indeed.
It's "extremely simple," according to Julian Green.
You first needed to hook up the phone line to the modem, and then connect the modem to the computer: