whistle with fingers

anyone know how to do this? I can kind of get it every once in a while, but when I get it it is extremely high pitched, not like the kind you usually hear. I know you aim your fingernails inwards and curl you tongue upwards almost touching the roof of your mouth, but does anyone know what I am doing wrong? Anyone have any pictures of how to do it?

I cannot whistle with or without my fingers.

I can do it with my pinkys... I put the tips together so they make a V shape.. then you put the tip of the T on the bottom of your tongue and curl it back, so your tongue is in like a backward C shaped. If that makes any sense, you just put your lips down and blow XD It takes some practice..
Doing it with your two fingers on one hand is pretty much the same but I'm not as good with it. It really just takes practice to figure out how you're supposed to position everything to work.

I would be such a badass if I knew how to do this. Please find that guide.

Linkage

Well with snapping your fingers..have you tried with all of your fingers? Cause for me it only works with my middle finger and them, but other people can use their pointer finger.

I tried whistling with my fingers, but the only thing that happened was that I found out how my fingers tasted...

I hate you guys...I'v been trying to whistle with my fingers for 10 minutes and now I have saliva all over and my sister walked in on me