Click on the appropriate list on the left-hand menu (under "SF Wiki"), for instance, "2006 - Publications in English."
At the top of the page you'll be presented with, you'll see the page title, and the word "Edit." Click on Edit.
You'll then be able to add the work you want. Put it under the appropriate subheading (such as SHORT STORIES), in the proper spot in alphabetical order by author's last name, and copy the format others are using (with magazine name in italics codes, for instance).
When done, click on "Preview" at the bottom of the page, check out how it looks, and if you don't like it, change it (there will be another editing window at the bottom of the preview window for making new changes). When you are satisfied, click "Submit," and you're done.
Feel free to add works as soon as you know the publication information (including issue date for magazines); you don't have to wait until the work is