iCloud: Use iCloud.com
You can use iCloud from anywhere by signing in to iCloud.com from a Mac or Windows web browser recommended in the Apple Support article System requirements for iCloud.
Sign in to iCloud.com
Sign in to iCloud.com using two-factor authentication or two-step verification
Follow the onscreen instructions to verify your identity by entering a code sent to a trusted device.
You must verify your identity this way to use any web app except Find My iPhone. You can use Find My iPhone by clicking it after entering your Apple ID.
Note: During two-factor authentication or two-step verification on iCloud.com, you can choose to trust the browser so that you won’t be asked to verify your identity the next time you sign in.
Switch to a different iCloud.com feature
At the top of the iCloud.com window, click the name of the feature you’re currently using, then click another feature.
If you have web-only access to iCloud.com, you only see Contacts, iCloud Drive, Notes, Pages, Numbers, Keynote, Settings, and Launchpad. To see and use other iCloud features, set up iCloud on your iOS device or Mac.
Sign out of iCloud.com
Do one of the following:
Sign out from the browser you’re using now: Click your name at the top of the iCloud.com window, then choose Sign Out.
Sign out from every browser where you’re currently signed in: Go to Settings on iCloud.com, click Sign Out Of All Browsers (in the Advanced section), then click Sign Out.