You can unlock the Editor by buying it from General Adventure Center in the SpisMall.

For instructions on how to use the editor, see Dr. Lunatic Editor Help[hamumu.fandom.com] on the official Hamumu Wiki.

If you want your world to eventually be added to the Verified Worlds and be eligible for Steam Leaderboards, visit that collection to read the guidelines.

While you have the world loaded in the editor, open the File menu and click the "Save & Export" button.

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From this menu you can review the list of files (music and text files) that will be bundled with your world during the upload. Click "Upload and Publish" to post your world!

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Once your world is uploaded for the first time, you can return to this screen to post updates. You can also use "View in Workshop" to modify the title, description, and so on after posting.