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Zur Montage muss an der gewünschten Seite des Lenkers das Lenkerband abgewickelt werden. Then plug the bell to the open end of the handlebar as strong as the base of the bell sits tightly on the handlebar. The lever of the bell should point upwards. After that fix the base at the handlebar with adhesive tape.   Subsequently retape the the handlebar tape starting at the ring-shaped part of the base. An wonderful article of the bicycle magazine Tour  will help you with that. In general please ensure that nothing touches the aluminum body of the bell. This might massively worsen the sound of the bell.
For mounting the bell please unwind the handlebar tape at the desired side of the handlebar.