To submit a deliverable you need to have access to the biblio and to the administrative type for deliverables (site leaders and work-package leaders).
In general your deliverable will be a PDF (even if it is a prototype, it must be accompanied by a cover document) with the cover page conforming the MOLTO style, including logo and summary table for the metadata.
Create a biblio item of type deliverable, the more information you enter, the better the search engines will be able to index and retrieve your work. Attach the PDF to the item.