While you can manage your system user and database passwords through ServerPilot, you must contact your server provider if you need to reset your root user password.
Many server providers offer automated methods of doing so.
First, after logging in to your DigitalOcean account, click Access.
Then, click the Reset Root Password tab.
Finally, click the Reset Root Password button.
DigitalOcean will email you a new temporary root password that you will need to change by SSHing in to your server.