How to Annotate in iBooks

Open the book you want to annotate in your iBooks app. Browse through the content until you find the sentence or paragraph you want to annotate or annotate on the fly as you read a book.
Touch and hold your finger on the passage until the contextual menu and selection handles appear. Adjust the selection handles to select as much or as little of the text as needed. You can select individual letters, words, sentences and paragraphs as needed.
Touch the “Note” option in the contextual menu after you finish adjusting the selection. Type your note and then tap away from the note area to close and save. If you're using an iPhone or iPod Touch, you'll need to click the small right arrow on the contextual menu to display the 'Note' option.
On the iPad, tap the small note icon to the right of your annotated passage to view or edit the note. On all iOS devices, the annotated portions of a book or document in iBooks are indicated by the presence of highlighting. Tap the highlighted text to display a list of extra options. Click the color circles to change the highlight color, the trash can to delete the note, the note icon to edit the note or the share icon to copy or share the highlighted text.
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How to Change the Sleep Mode in Mac

Go to the 'Applications' folder and double-click 'System Preferences.' Select the 'Energy Saver' icon.
Adjust the 'Computer sleep' and 'Display sleep' slide bars to change the time when the computer will go into sleep mode. If you are on a portable, use the tabs at the top of the screen to adjust the sleep mode times for when the computer is running from the battery or the power adapter.
Click the 'Schedule' button and enter a specific time for the computer to wake up or sleep, if desired.
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