Yes - you can use both of your hours of reservations on one day.
Simply make two one hour reservations back to back. After you two hour session you can then make a new reservation for a subsequent day. Please skip a day for your next session if you have used two hours in a single day.
This helps guarantee equal access for all members.
The app is called WIX that you use to make reservations. Download WIX from the Apple or Google app stores. From this app you can create and manage your reservations just like you can from the web site.
See the link on the button for details on how to set the WIX app up.