You can select the map in the Map type list in User Menu (1) - User Settings (2) - Map type (3).
To scale the map in the web version of the application, use the buttons +/- or the mouse wheel. In the mobile version, use the buttons +/- or special gestures:
Click on the button to center the map on your own location, that is, the location of the device from which you have logged in. This option is available only in the web version of the application.