Particles will not render

I click f12 and they dont show. i tryed clicking the button that is for allowing the particles to be visible on rendering but they still dont show, please help, thanks

particle have to be of “halo” material, then they are lights-kind
or they have to be an object, then you have to provide a “dupli-object”,
for example a simple cube or plane, thats duplicate for every particle.
If the size for the particle is set too low (nearly to zero), then you might
not see anything, you have to pull up the particle-size, because this
sets how big the dupli-object will be rendered for every particle.