I installed PostgreSQL via the graphical install on http://www.postgresql.org/download/macosx/
I see it in my applications and also have the psql terminal in my applicat
If Postgres was downloaded and installed, running this should fix the issue:
sudo mkdir -p /etc/paths.d &&
echo /Applications/Postgres.app/Contents/Versions/latest/bin | sudo tee
/etc/paths.d/postgresapp
Restart the terminal and you'll be able to use psql
command.
Ref: https://postgresapp.com/documentation/cli-tools.html