i'm following this forum since 2 Weeks and trying to set up a newsletter, everythin works fine - except one thing

I want to send out a registration email to the subscriper, i've followed the steps stick to the manual but there are somethings not really clear:
in the manual example, there are 3 actions created:
double opt-in: subscription
double opt-in: send email
double opt-in: confirm
my question:
why is the send email action a seperate action and don't included into the subscription action?
another question: if it should be 2 seperated actions: how i bind 2 actions in one form? the drop down menu at the bottm of the site, is for the "error msg" isn't it?
maybe its possible that someone show me an example for that whole progress or just give me a hint.
thx for reading
