@t101 @Sonny : Thank you to both of you. It's very kind.

Now a quick question to everyone. In the form that bitpay.com has provided me for donations, there is an optional field for email address.
I'm wondering what's the exact use of this ? Am I supposed to receive the email address of my 'donators' (I don't know if the word exists in english, maybe its 'donor'?)
as a comment in the payment info ? someone knows ?