This is just a guitar app. you can select left hand chord by clicking on L.H. menu or select right hand fingering by clicking on R.H menu. on main screen, you can set play speed, change chords and fingering that you picked from L.H. and R.H.
click the round buttons on top, it will play that chord, if you want to change fingering, just select the number and letter on vertical segment controller on the left. you probably can sing a song while play with it.
enjoy!