When you create your initial application form you should have entered an email address. Otherwise you couldn't continue filling out the rest of the form IIRC.
There is an "additional" section in the CAE form. Use it for whatever you see fit. There's a lot of debate about whether it's best to fill it with some useful info or leave it black. People have had replies with it blank. I put my exam scores in there plus some other stuff and got a reply with a request for my CV.
Good luck!