Every installed app on the Apps tab has a card, and the card carries what you need to actually use it:
- Open app - the address the app answers on. For an app linked to your domain, that is the domain; otherwise the server address and the app's port.
- Connection details - the logins the app was created with: admin users, database passwords. Values are masked; press the copy button next to one to copy it. These are the details recorded at install time - if you changed a password inside the app afterwards, the app is right and the card is stale.
- Data folder - where the app's files live in your account. You can reach it through the Files tab; it is yours.
- Open shell - a terminal inside the app's container, in the browser, as the app's own user or as root. For following logs, running the app's own command-line tools, quick fixes.
The card also shows the app's state. Crashing means it starts and dies repeatedly - the hint on the card says what to check first, and "My app says Not starting" in this category goes deeper.