Standby system SATS

All of the SAT testing centers have no seats available. I want to register for the standby system? where I choose a preferred testing center, and College board notifies me when I can take the place of someone that has canceled.
Can I do this on the website?? If so, how? I don’t really see the option to go on this system.

I would call College Board when they open today.

But for what it’s worth, I don’t see a whole lot of kids cancelling for the October SAT except for illness-- and I’m not sure anyone would have enough notice for that to do you any good.

I would register for the November exam.