How to install any app like Mindmap

how may I install the Mindmap app? I never done this.

The app is available in the app store, so you should follow the standard app installation procedure described in the administrator guide

hello and thank you.

how do I create a administrator account?

after installing a server (without configuring anything extep admin username and password) I tried to install the mindmap app. But there was a error message. What does that mean?

“Client error: GET resulted in a 404 Not Found response: 404 Not Found

404 Not Found

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Have you tested to install the app Mind Map? Have you use the AppStore? Use this link change your Nextcloud url: https://cloud.server.tld/settings/apps? Search “mind”. Which Nextcloud version do you have? Check it with https://cloud.server.tld/status.php. The app Mind Map is official not supported for Nextcloud 26.