To add an annotation, tap and hold the text where you would like to add the annotation, and tap NOTES on the pop-up that appears near the selected text. Then on the Note pop-up, tap below the selected text, enter your annotation, and tap Save. The Note pop-up will close, and you will see the selected text highlighted in grey. If you tap the grey highlighted text, followed by the Note icon, the Note pop-up will be displayed with your annotations. Your annotations will be retained, even if you close and re-open the eBook.