Select the dictionary you want to use in the menu. (Only the French dictionary is available for now, the menu is there only to illustrate the future interface.)
At the left of the input field you have an indication of the translation direction. To reverse the direction click on the indication.
Input the word you want the translation for, then press the Enter key or click the Find button.
If you allow cookies in your browser for this site, your settings will be saved for when you come back to use the dictionary.