Well i did submit it. Selected which project (set with all these settings that were described). After submission i see "Awesome, projects has been submitedt". And i found information "Submissions will be available after the jam has ended".
I can still edit my project and fix things when needed. It is just registered there in submissions i think.
EDIT: I found out that i can still access my submission from the project and there i can edit it, or remove the submission. So don't be affraid. it is not one time submission thing with closed access afterwards.