I'm new to PostgreSQL. I just installed the Postgres.app on my Mac and wanted to use the psql command in the terminal. However, when I type psql in the terminal, I'm asked to input the password. I was never asked to set a password during installation so I'm confused what the password is. I've looked at other similar questions but none of them worked for my case.
$ psql
$ Password for user kaili:
$ psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed:
FATAL: password authentication failed for user "kaili"
Could anyone give me some hints on how to access the database as the user kaili? Thank you!