If you have an individual account, you got an email with the login information to https://my.collective.tools.
In your browser
Log in at https://my.collective.tools.
Desktop
Download the Nextcloud app at https://nextcloud.com/install/. Fill in the address to Nextcloud as your server (https://my.collective.tools) and your username and password to log in. This will sync your files to your desktop computer. To use email, contacts and calendars using desktop programs, see the respective articles in this documentation.
Mobile
Download the Nextcloud app in the app store for Android or iPhone. Fill in the address to Nextcloud as your server (https://my.collective.tools) and your username and password to log in. This will get you access to your files. To use email, contacts and calendars using mobile apps, see the respective articles in this documentation.