For programmes and courses that use Fronter: https://fronter.du.se/
To log out from the University website, you need to close your web browser (all windows/tabs).
The reason for this is that we use something called "single sign-on". This allows you to remain logged in in a number of different systems. This way you avoid having to log in, for example, to both My Pages and Learn - one log in is all that is required.