After finding a new badge you want to work on you will need to click the "join badge" button. You will see all of the evidence required for earning the badge with descriptions of each piece of evidence. Different badges require different evidence formats (image, text, link, tweet, etc.). You can add different pieces of evidence over a span of time or complete all of them in one sitting. After you have saved your evidence you can submit a request for feedback from those members who have already become badge experts. Once someone has reviewed your evidence for the badge they will either reward you with the badge or give you suggestions for changes to make to your evidence.