Click "Translate" tab and the pages of the website as well as all selected languages appear. Choose the page and language you wish to translate by clicking "translate" at the end of the selected line. This will open the translation tool allowing you to see the selected page. You may choose "Select All" to check and translate all strings (words or sentences) or go one by one taking mouse on top of the text and clicking blue pencil.
TAKE A LOOK: How to use the translation tool?