Just start typing in any box and the tip will be calculated automatically.
North American Tipping Guide
15-20% of the bill, including drinks.
10% unless their credit card machine is "broken", then no tip.
It is now possible to tip using the app. Most people don't tip, so a small tip would be very appreciated.
A few dollars
$2 per day, or more if your room is messy. These are some of the lowest-paid employees, so tipping is a very nice gesture.
If you really enjoyed the tour, then tip 5 or 10 dollars for your entire party.