Samax here! Enter as much information as you feel comfortable sharing, so I can update you on the stuff you care about! At least a first name and email... but the more, the better.
Remember, you can always change it later.
By the way, ALL information you give me is confidential unless you tell me otherwise!
I don't share your info with anyone unless they need it to help me do what you're asking me to do (like giving it to the post office or UPS to mail you stuff).