Updated for 7.0
Click on the Settings icon (the gear) located to the right of the search bar. This will take you here:
Within the horizontal navigation bar, select User. Then, Substitute Settings. This will take you here:
To change the Default Users Type, click the corresponding box. This will provide drop-down options.
From the drop-down options, select the desired Default Users Type.
To change the Default Dues Type, click the corresponding box. This will provide drop-down options.
From the drop-down options, select the desired Default Dues Type.
Click Confirm Change in the pop-up box to save changes.