1. Click on the "Hello {your name}" link or your photo in the top right corner to see a summary of your user preferences (you also can change formats, language, password and other stuff from here).
2. Click on the green Logout button. You will be returned to the Login panel.

Alternatively just close your browser session by clicking on the close tab or close window "x" in your browser (exact layout varies between browsers).

Next time you access iBE.net you will be automatically logged in if you clicked on "Remember me" last time you logged in (and it has not expired).