Are you responsible for multiple B.V.'s in MyJAM!? Or are you registered with us as owner and employee? Then you're able to switch from roles by going to the right top of your dashboard and click the button with the two arrows that point in opposite directions. That is the second button from the left (see below). You'll consequently get to see the various roles that you have access to.
Press the 'hamburger menu' at the top left and press the two arrows pointing in the opposite direction.