1.

Search English words you don't know using Google or the Google Dictionary Chrome extension
If you don't use these to look up words you don't know, CravingWords won't
be able to save them
2.
They're automagically saved
by CravingWords
You also have to install the CravingWords Chrome Extension for your
words to be saved

3.

They're emailed to you in the evening so that you can really remember them
Every evening at about nine, you'll receive a list of all words you didn't know during the past three days along with their definitions, right into your inbox