Hello vfrio,
Welcome to the Apple Support Communities!
It sounds like you edited your existing Apple ID to a new email address and changed the password as well. To change this on your computer, you will need to sign out of the old account and into the new Apple ID in iCloud for Windows. Please use the attached article as a further reference.
What to do after you change your Apple ID email address or password - Apple Support
Open iCloud for Windows and click Sign Out.
- If you're signed out, sign in with your updated Apple ID or password. The data in iCloud will automatically appear on your device after you sign in.
- If you're signed in with your previous Apple ID:
- Click Sign Out. Depending on what iCloud options are turned on, you'll be asked if you want to make copies or delete iCloud data (Contacts, Calendar, Reminders, Bookmarks, Photo Stream) from your PC. Click Delete. Your data will remain in iCloud and will be updated on your device when you sign in to iCloud again.
- Sign in with your updated Apple ID or password.
Have a great day,
Joe