Please help! I need to know if i can fix this!

I recently bought a Rust key. I entered it, chose my username entered my email and clicked ok. Its been 10 minutes, and i Havent gotten the password that it was supposed to send me. Ive checked my spam and junk folder as well. Is there anyway, for me to change my email, or even figure out if I might have entered in my email wrong? anything to help would be amazing! Thanks.