System Settings is only necessary to configure if you are using TeamGenius registration. This is where you can add in drop down options to appear within the Position field on your registration form.
To access the System settings click on settings in the top menu.
Then click on "System Settings" in the top menu bar.
In System Settings, you can add in your position names to the Position Field box. Simply type the name of one of your positions, then hit the Enter key. Type in as many positions as needed, then click the Save button at the bottom.