The form for submitting your final project is here: Final Project Artifact Submission Form
You should submit your final project by Tuesday, Dec 6 (AoE), which is 7:00am Eastern Time on Wednesday, Dec 7 (there is a 4 hour grace period on this, so you can submit up to 11:00am Wednesday, Dec 7 without any need to arrange an extension).
Note: this is different from the form you should use to submit your presentation: Project Presentation Form (as mentioned here).