The five green bars show you are a native in that language, and that you are fluent. You can make the red bars show up by hovering over your picture in the top right corner, clicking "Edit Profile" then scrolling down to your languages. There is a little 'pencil' like icon at the bottom of the languages box, and if you click on that it should bring you to a new page where you can either add more languages or change the levels of the languages you are learning =)