Once you log in, you'll be taken to a page where you'll be asked to create a 'Book' or 'Course'. You can select either of them. Write the 'Title' of the book or course.

Scroll down and click on the "Add to Plan" button. This step is carried out to activate the author's account.

Now go to your profile using the navigation as shown in the pic.

In the "About You" field, you can write your content and place your contextual backlink. And then scroll down to click on "Save Settings" button.

Voila! Your backlink is ready.