The only time you can edit whether a creation is anonymous is when you are in the Meme Generator. The final image page would either have your username or say anonymous depending on the option you selected.
After a creation is generated, there is a "Change Settings" button available in the Meme Generator. If you don't use that button then and proceed to the image page, the captions and "Made by" info can't be edited.
Hope that helps.
Caption this Meme
