SECOND WAY (The harder way)
1. Create an Imgflip stream where the currently-logged in account (Account 1) is the owner.
2. Submit an image to the stream, and approve it (if necessary).
3. Under that image, log in as Account 2 and create a comment.
4. This step is crucial. Maintain two separate tabs: the first of Account 1 being logged in with the URL of the image with a comment commented not by Account 1 under it loaded into the tab; the second of Account 1 changing the settings of the stream.
5. Under the second tab invite a separate account, Account 2, to become a moderator.
6. Under Account 2, accept the moderator invitation. Create a third tab of Account 2 changing the settings of the stream.
7. Under Account 1, promote Account 2 to an owner. After this is done, you can close the second tab and solely focus on Account 2 changing the stream settings now.
8. Under Account 2, demote Account 1 to a moderator.
9. Under Account 2, remove Account 1's moderator.
10. On the first tab where the "delete" button is shown on a comment not made by Account 1, which originally had the ability to delete comments but now doesn't, click on it (and create a random reason why). This unique error code will then show up as well.