if you cd into the directory you'll need to type
(it's a security precaution; the current directory is not in the path)
By 'in your path' he means the list of directories that are searched for an executable when you type a command into the terminal. You can find out the current list by typing:
You can add a directory to your path with
and if you add that line to the file .bashrc in your home directory it will add it automatically each time when you start bash.