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 blue 'Create Post' button on it, near the top, to the right.
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 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. The button to make them is found on "area" posts. We decided proposals needed their own section because they can pertain to many problems and ideas at the same time.
The easiest way to remember the difference is that Needpedia was made to list ideas for problems with things, because we realized it's so important that people can see all their options, side by side, for any one problem they experience. Needpedia only has a proposal section because we realized people would need one of those too.
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 website or app on Earth.