How to use Physics.IgnoreLayerCollision

I want to prevent objects falling down from colliding in the air
I created 2 layers named apple1 and apple2 but it doesn't work.
void Update ()
{
physics.ıgnorelayercollisio the (8,9);
}

But it didn't work, can you help?

 

1. Use code tags when posting code
2. When posting code that has a problem, copy and paste the exact code, don't try and retype it. (and, I'm going to take a stab in the dark, especially don't try and retype it on a phone? It sure looks like autocorrect inserted a "the" there) When you retype it, that can introduce any number of new issues that will probably hide the actual problem. (in this case, capitalization and a bizarre "the" inserted for no apparent reason)
3. Specifically say what you mean by "didn't work". Does it give you a compiler error? Does it have no effect?

 

I'm sorry for the way of expression, the game is a team game to put the picture I couldn't tell properly in the form of writing a bit ridiculous, thank you for the suggestions.

 

What I really want is how this ignorecollision is used for a single object?