These features can all be managed from the Settings of the SwipeSimple Mobile App or SwipeSimple
Go to Account Settings and select the Transactions tab. Here you will be able to edit Signature Settings, Tax Settings, and Tip Settings.
You can select when to ask for signature, whether to collect tax, whether to prompt for tip and what the default tip options are. Once this is updated, it will apply to your SwipeSimple account across all devices.