Hi Aleksandre9501,
Thanks for contacting Apple Support Communities!
We see that you need some help with iCloud. Is your MacBook Air running the most recent macOS version? If not, you may consider updating your Mac then update your iCloud information. If you need help to update your Mac, this is a handy resource to guide you: Update macOS on Mac - Apple Support
"Use Software Update
- Before installing new software, it's a good idea to back up your Mac. If you have an external storage device, you can use it to back up your Mac with Time Machine.
- To check for new software, open Software Update:
- From the Apple menu in the corner of your screen, choose System Settings. Click General in the sidebar, then click Software Update on the right.
- Or in earlier versions of macOS, choose Apple menu > System Preferences, then click Software Update.
3. If Software Update finds new software, click the Update or Upgrade button to download and install it. You will be asked to enter your administrator password, which is the password you use to log in to your Mac. During installation, your Mac might show a progress bar or blank screen several times.

If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model. Software Update shows only software that is compatible with your Mac. "
If you need additional assistance, you can also reach out to Apple directly here: Contact Apple Support
Kind regards.