You can publish the game yourself.
1. Sign in to the hub.
2. Open the "Versions" tab.
3. Confirm that there are no warnings or errors that would block the publish. If so, fix them.
4. Open the "Edit" tab.
5. Setup as many (or as few) of the details and assets you want. (Background image, game icon, title, etc.)
6. Open the "Publish" tab.
7. Select the desired version in the drop down.
8. "Publish Game" - this will deploy the version to the "Inactive Versions" list.
9. Select the version in the inactive list and select "Set as Active Preview". This will make the game the active version that users will get.
10. Open the "Preview" tab.
11. Either - add users to the "Preview Users" list if you want the preview to be private OR "Enable Hidden Preview" if you want the preview to be public.
12. Share the game link as wide as you want.
Let us know if you hit a sticking point.