Answer: After you have logged in and have landed on the my Images page, click on the "All Family Members" drop-down menu button. 

From there, select the "Add Family Member" option. You will then be prompted to input the name of the Family Member you wish to add. Upon hitting enter you will be brought back to the my Images page, and you can now access your new Family Member's folder through the "All Family Members" drop-down menu.