I believe you have the option to link an itch.io page as an entry through the main page of the jam once submissions are open, however I am not completely sure as in my prior game jam I forgot to check for that and only made the itch.io page.
If anyone here knows the correct way, feel free to correct me.
when the jam starts there be some type of submit button on the jam page and all you do is click it and upload your game then go into your dashboard and click on your game for the jam and make it public then boom you submitted
