You may be saying, hey, nothing much is happening yet in this film. Who cares about the stupid lovebirds? Where's the horror?
You'd have a point; lots of critics feel that The Birds gets off to a slow start.
Finally, Melanie gets out of the car and goes into the post office to ask where Mitch lives.
There follows a conversation that goes on forever and ever, designed to provide a logical reason for Melanie to go across the bay to the Brenner house in a boat because Hitchcock thinks that will let him set up some nifty shots.
You also learn that Melanie is trying to deliver the birds as a surprise gift to Mitch's sister.
The post office clerk is pretty taken with Melanie. She seems used to people thinking she's pretty.
Anyway, there's more nattering. The clerk and a visitor can't seem to agree on Mitch's sister's name. Melanie wants to put it on the card.
The clerk sends Melanie to Annie Hayworth's house. Annie is the schoolteacher, and she'll definitely know Mitch's sister's name.