Placing logout button in menu-less application

1. Where do I put the log out button?
2. Why is logout button important?
3. What color should log out button be?

Where do I put the log out button?

The most common placement pattern for a “Log out” button or link is within the upper right-hand corner of a screen. That is the place that has become the intuitive exit area for users, ever since Windows made that top-right 'x' the standard close pattern.

Why is logout button important?

A logout button in mobile surveys usually carries out two functions: saving the data that have been entered and closing the survey to prevent unauthorized entry; it is, therefore, an integral part of any online survey instrument.

What color should log out button be?

The set of login logout buttons is a normal looking login and logout buttons that can be used by any website. The login button is colored blue and the logout button is colored red.