From the main menu, use the arrow keys to highlight Open Database.
Press Return/Enter.
The list of available databases is read from:
~/.local/share/mpass/
Navigate through the list with the arrow keys to select your desired database file.
Press Return/Enter to proceed.
At the prompt, type your database passphrase.
Press Return/Enter to unlock the database.
From the Open Database menu, press q to quit and return to the main menu at any time.