Laravel PHP Command Not Found

I have installed Laravel using composer without problems, but when I try to execute "" in my terminal I have this typical error:

-bash: laravel: command not found If I read the documentation of the official site I need to do that: Make sure to place the ~/.composer/vendor/bin directory in your PATH so the laravel executable is found when you run the command in your terminal. But I don't know how to do. Can you help me with that? Thanks!!