Add the tag to an image. To do that, go to the image page, and on the right of the page you will see a "Tags" section. At the end of it, there will be an "Add tags" link. Click on that and you have a field where you can type your tag.
You don't need to be a mod to make tags. See the first post in the thread, it contains an example of how you should let us know about the tag. Feel free to ask questions if you have any, and make sure to use the "Quote in Guestbook" option, not the "Report" one when replying :)
