Directory Problems

Hello, I am 13 years old and I was wondering how to use my arduino. I was building one of my projects (my first time using arduino uno) with the uno and every time I try to put my program in place it keeps on saying "No such file or directory". I need some help on how to transport this command into the arduino uno.

Thanks

it keeps on saying "No such file or directory"

"It" says a whole lot more than just that.
That's what you need to share.
That, and your code.
In code tags.