In order to retrieve online requests from Reservation Friend, the appropriate settings need to be configured in Maintenance / Online Setup / Online Reservations - Connections & Options. This allows Campground Master to retrieve the reservation data E-mail messages from a POP3 mailbox.
These settings are exactly the same as for setting up for E-mail Requests, so refer to that section for details.
The connection settings are separate so that you can use a different POP3 mailbox for Reservation Friend requests than you do for other E-mail requests -- this is recommended so that you can handle them separately. You can also specify different defaults for online payment transactions, so for instance you can indicate that the deposit (or payment) was made directly to Friend Communications.