I created a blog and did my best to make it un-blog like, and more like a website. You can view the blog here. I created a page (rather than a blog post) and put up some instructions for completing the badge, including a video and discussion questions which participants should respond to in the form of a comment.
Then I created a google form and I link directly to the form from that original page. The form has a place for participants to enter their name and email. The email is important, because I need this in order to issue the badge. I put a couple of other questions on the form (although I'm not attached to the overall content of the badge at this point--I'm just playing with format), and then a note at the bottom of the form tells the viewer how they will be able to claim their badge.