The mode can be changed at any time by hitting the keys 0 to 9 (q.v. What is a mode?). To reach the modes equal or above 10 you must press the left Shift-key and the number at the same time. This increases the chosen number by 10.
Note: The keys on the num-block will not work for this purpose. They are available for selection of the location mode (q.v. The location mode).