it's a custodial web application. think of it as a spending wallet. if you want something for large amounts of money long term, you should use something else that you control the keys.
Do I install coinos app now?
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It's a web app. There's nothing to install.
So if I click the zap icon, it takes from the web app?
Yes. The zap icon is linked to the web wallet.
You can practice by Zapping as little as 1 sat people.