OS X El Capitan: Change iCloud feature settings
If you want to turn iCloud features on or off after setting up iCloud on your Mac, or change feature options, use iCloud preferences. If you set up a second iCloud account on your Mac and want to change its settings, use Internet Accounts preferences.
Change settings for your iCloud account
Use iCloud Preferences to change iCloud feature settings. To open iCloud preferences, choose Apple menu > System Preferences, then click iCloud.

Change account details: See Change iCloud account information.
Set up Family Sharing: You see this button if you haven’t joined a family. An adult can set up family sharing.
Manage Family: You see this button if:
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You received an invitation and want to join a family.
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You’re a family member and want to stop sharing your purchases, stop sharing your devices’ locations with other family members, or leave the family.
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You set up Family Sharing and want to manage the family. For example, you want to add members or resend an invitation to join, or to control young family members’ spending.
Change feature settings: Turn on features you want to use, and turn off features you don’t want to use.
Some features have additional settings you can change by clicking Options or Details near the feature name when the feature is turned on.
If you turn on Contacts while your Contacts app is synced with Google Contacts, Google syncing is turned off. You should keep it turned off while using iCloud for your contacts.
Change iCloud Drive options: If iCloud Drive is turned on, click Options to select which apps can:
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Use your iCloud storage for documents and data
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Let other people look you up by your email address (the one you use as your Apple ID for iCloud)
Change iCloud Photos options: If Photos is turned on, click Options to turn the following features on or off:
On a Mac with iPhoto or Aperture installed, see iPhoto Help or Aperture Help for information about the last two features.
Change iCloud Keychain options: If Keychain is turned on, click Options to change:
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Whether your iCloud Security Code can be used to approve iCloud Keychain on new devices
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The iCloud Security Code and the phone number used to verify your identity after you use the iCloud Security Code
If “Waiting for approval” appears below Keychain, click Options to enter your iCloud Security Code instead of approving this Mac from another device. If you forgot your code, you can reset iCloud Keychain.
If there isn’t an Options button next to Keychain, your Apple ID is set up for two-factor authentication. In this case, when you set up iCloud on a new device, you allow the device to use your iCloud data simply by entering the login password or passcode of your Mac or iOS device that already has iCloud set up.
Change Find My Mac details: If “Location Services is off” appears below Find My Mac, click Details, then follow the onscreen instructions so you can locate this Mac.
Manage iCloud storage: Click Manage. See Manage iCloud storage.
For information about using the Photos, Mail, Contacts, Calendar, Reminders, Safari, and Notes features of iCloud with the corresponding Mac apps, use the app help links in Apps included with your Mac.
For information about Back to My Mac, see Use Back to My Mac.
Change settings for a second iCloud account
You can add a second iCloud account in Internet Accounts preferences to use with Mail, Contacts, Calendars, Reminders, and Notes. You can use only your primary iCloud account for other iCloud features, such as iCloud Drive, iCloud Photos, iCloud Keychain, Back to My Mac, and Find My Mac.
You can change the settings for your second iCloud account in Internet Account preferences.

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Choose Apple menu > System Preferences, then click Internet Accounts.
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Turn on features you want to use with the selected iCloud account, and turn off features you don’t want to use.