Here's how to highlight any text in the e-book section, and write comment:

1. Select the text you want to highlight.
2. Click the Annotate Adder icon from the popup box. Click Save.

Add comments, tags and select any of the color in which you want your text to be highlighted.

Hover on the highlighted text, a popup will appear on which you can see your comments.

1. To edit the annotated text, click the Edit icon and save it again.
2. To delete the annotated text, click the Cross icon on the top-right corner of the popup.