If you have a My EBSCO account, you can make notes in the online reader. To do so click on the My Notes tab and click 

This opens a text box where you can start typing your note

Once you are finished typing your note, click the Save button.

You can sort your notes by date created or by page number.

Open a note by clicking on it. When it's open there are four icons in the top right corner

Clicking the book icon takes you to the page that was open when you created the note, so you could use this as a bookmark maybe.

Clicking the pencil icon, will allow you to edit the note

Clicking the printer icon lets you print the note

Click the bin icon to delete the note

book's annotations in the online reader as above