OS X Yosemite: 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
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 Sharing: 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, 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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Store documents and data in iCloud Drive
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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:
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iCloud Photo Library (available with OS X v10.10.3 or later)
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My Photo Stream
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iCloud Photo Sharing
For information about these features on a Mac with OS X v10.10.3 or later, see Photos Help. For information about the last two features on a Mac with iPhoto or Aperture installed, see iPhoto help or Aperture Help.
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.
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
If you set up more than one iCloud account on your Mac, you see one of them in both iCloud preferences and Internet Accounts preferences. That account can use all iCloud features, and you can change most of them in either place. If you set up another iCloud account in Internet Accounts preferences, you can only see it there, and only Mail, Contacts, Calendars, Reminders, and Notes are available.

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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 of features you don’t want to use.