Your OstoBuddy Home screen displays your next recommended appliance change in the lower right corner of the page. Normally this writing is white , however it will appear red when a change is due. When you change your appliance, tap on the lower right corner writing and you will be prompted to enter the supplies used with that appliance change. Check each supply you used and adjust the quantity if needed.
You can also open the Use Supplies screen by tapping the “+” icon on the upper right of the action bar on the Supply Usage screen.