First, make sure your proposal is actually a flushed-out proposal. Visit this 2 page guide to check:

Your proposal might actually be just an announcement! See the diagram to be sure.

After you are confident about your proposal, click on “dashboard” at the top of this site and create a new post. THE MOST IMPORTANT THING IS TO SELECT THE “PROPOSALS” CATEGORY located in the right sidebar.

Then, once your proposal passes, go back into your proposal post and change the category selection from “Proposals” to “Passed Proposals”. Make sure you include the date your proposal passed. Without a date, your proposal will not be accepted into the passed proposals section.