Click the avatar icon in the top right corner of the dashboard.
Click "Career Page Designer."
Click "Sections" in the left sidebar.
Choose the appropriate section for the type of information you want to add. You can also customize the section names if you don't see one that works.
Once you've checked a section it will show up in the page body to the right of the side bar. Hover over the newly created section (you may need to scroll down to see it) and you'll see options to move it, edit it, or delete it.