Maybe you meant to say how to submit your game in the jam submission.
The process is quite simple, there's a big "submit your game button" then answer asked questions then you will get to choose in how you wanna submit your game
1. Select a previous project, if you have already uploaded your game in your itch account. If you don't know how to upload on itch then watch a tutorial
2. New project, this would ask you to create a new project.