Step 1: Head to the Settings menu. This can be done by tapping the cog icon in your notification shade.
Step 2: Find Apps (or Applications, depending on your device) in the menu, then locate the Avi-On application.
Step 3: Tap on Storage and the buttons for clearing the cache and app data will become available (pictured below).
Step 4: Open the application on your device and use your credentials to log into your account.