OS X Mavericks: Share your screen using Back to My Mac

Follow these steps for each computer whose screen you want to share.

1. Choose Apple menu > System Preferences, then click Sharing.
2. Select Screen Sharing.
   If Remote Management is selected, you must deselect it before you can select Screen Sharing.
3. Next to “Allow access for,” choose all users, or only listed users. If you permit only listed users to have access to the screen, click Add (+) and Remove (-) to edit the list.
4. In System Preferences, click Show All, then open iCloud preferences.
5. If you aren’t already signed in to iCloud, enter the Apple ID you use with iCloud, then click Sign In.
6. Select Back to My Mac.
   To stop sharing your screen using Back to My Mac, open iCloud preferences, then deselect Back to My Mac.