If you are over the age of 18, you will need to mark/confirm this in your profile. If the account is for a minor, this field needs to remain unchecked. Here's how to change this:
Log in to your account.
Go to the "EDIT PROFILE" section in the drop-down menu in the top right corner.
On the "Work Availability (All Required)" tab, click "EDIT" then check the box that states "OVER 18".
Select save and verify your setting is saved.