Once logged in, click on "Account Settings"

Enter your backlink in the "Website URL" field. Also, write your content and place your contextual backlink in the "Profile Bio" field using the format as shown in the pic below.

Your first two backlinks are ready.

Now, go to "Blog Home"

Click on "Write New Article"

Now, you can write your content along with your contextual backlink. Once done, hit the "Publish" button.

Voila! Your 3rd backlink is also ready.