Slip the hand band over your four fingers so it that the shaker rests below the index finger knuckle, or in the space between the index finger knuckle and the thumb knuckle, as seen below. If the band is too large, then adjust the band using the velco end. For added volume, attach both shakers to the hand band.

Try such techniques as:
Keeping the beat with the shaker, and then breaking into a strum.
Sustain a chord, but keep the shaker keeping the beat.
End a song and pull your hand away while vibrating the shaker.
Sing with using just the shaker, and then break into a strum.