Contributing via kernel-janitors

I'm unclear as to how via kernel-janitors, I can support patches to the kernel. Are bug/documentation anomalies already identified in some archive, or are we expected to choose a subsystem, search for such anomalies as described in the KernelJanitor/Todo page, acknowledge our willingness to make fixes and submit patches to kernel-janitors@vgerkernel.org? What kernel subsystems are current being reviewed and patched by kernel-janitors? I'm certainly willing to lend my support to this work; hwever, I could use some guidance.