you have to access the module ../newsletter/register_subscription/XXX.
Where XXX is the ID or a custom choosen string by you when creating the subscription list.
So it should be normally something like http://yourhostname/newsletter/register_subscription/1
I hope that helps you. Additionally I would like to point you to the documentation as well: http://ez.no/doc/extensions/newsletter
I would like to know if I can bypass the "http://yourhostname/newsletter/register_subscription/1" form to subscribe to a newsletter. I have a contact form with collected info fields and a checkbox "subscribe to newsletter".