Why Is There No Submit Option?
If a breakdown is listed without a submit option, that means the project has not been opened by the Casting team for actors to submit.
Any project that allows actor submissions will have a submit option listed beside it. How Do I Submit To A Breakdown is helpful article with instructions on submitting to a breakdown.
To ensure you never miss an Open Breakdown, be sure to turn on Open Breakdown Notifications for your account, which means you will start receiving emails whenever a breakdown matching your settings is sent out.