This is where you can check the status of your MathsJam booking.
Alternatively you can:
IMPORTANT!I've had reports of people having trouble logging in.
In each case their browser has "helpfully" auto-completed one of these text boxes incorrectly, usually with their email.
This should only happen the first time you re-login, but it's very confusing - I know. There's nothing I can do about it - it's a weird browser problem. Now I know why web developers get paid so much. And deservedly so.
So be sure to double-check. To login you will need to give your given name, family name and password, but you won't need to give your email address again.