Your container is live.

You're looking at the default page, served straight from your own Linux box in the cloud. Nothing to install — it's already running.

Make it yours. Replace this page by editing /var/www/html/index.html — SSH in, or use the file manager in your dashboard.

Running an app? Put the command that starts it (listening on port 80) in /app/start.sh — the file is already there, ready to edit. It runs automatically on every boot — and after sleep/hibernation — so your app always comes back on its own. Services you start by hand over SSH do not survive a restart unless they're in it.