Step 1: make sure it doesn't already exist, (that's why there's no "Create Post" button on Needpedia's homepage).
Step 2: the search results page has a button that looks like a magnifying lens, crossed with a lighbulb. The buttons next to it currently aren't working but we're working on it.
Step 3: Once you've made a post for the area you're interested in, you can make posts about problems with it. And once you have a "problem" post, you can write "idea" posts for it. That's basically how Needpedia's wiki section is organized.
*If your idea requires a group of people to vote on something then you'll need to make a "proposal" post, which are tied directly to "area" posts. -because they can pertain to many problems and ideas at once, whereas the purpose of "problem" posts is to enable people to see all their options side by side, for any one problem they might encounter.
If you have any ideas for improving Needpedia remember that we'd love to see them posted to Needpedia. We plan to operate far more democratically, and innovatively, than any other existing social media site or app.