Hi! I downloaded FoFiX and i try to play it but when i press the keys there are no points how do i solve that

i mean the frets are not working properly its only working on guitar solo's

In addition to having the appropriate fret buttons held down, you have to press the button mapped to the "strum" function at the right time, just like in Guitar Hero and Rock Band. Guitar solos and "hammer on" notes are the only ones that don't require that you strum them.