1. Update all available repository and upgrade all packages to the latest
pkg update
pkg upgrade
2. Install PostgreSQL 13
pkg install postgresql13-server postgresql13-client
3. Add the PostgreSQL to the system boot:
sysrc postgresql_enable=yes
4. Initialize the PostgreSQL database
/usr/local/etc/rc.d/postgresql initdb
5. Start the PostgreSQL service and check its status
service postgresql start
service postgresql status