A few people have asked - so here are the full instructions on how to submit your project to the Sci-Fi Contest:

(Thanks to @RoGeorge)

- Login to your hackaday.io account
- On the upper bar, press "+Add a Project" to create your new project. At this point it is not mandatory to finish documenting your whole project. You can came later and edit/add what's new.
- After you create your project, click on your new project
- In the left side of your project, under the project picture you will see a drop-down button named "Submit Project to...". Choose the contest name and submit your project.
- By now, you should see your submitted project listed somewhere in this page:

https://hackaday.io/submissions/2017-sci-fi-contest/list