The newsletter now requires use of the UserDefinedForms Module (the abillity to create / edit forms in the CMS). Download that module, install it and you should be able to create your subscription form
I now have the newsletter module and userforms running in 2.3.0 - but when i submit the subscription page i get the conformance but the new subscriber is not inserted into the database. Whats going wrong here?
When you have installed the "User defined forms"-module you can create a page type "Subscribe Form".
This form lets your subscribers fill out the form and on submit are added to your newsletters mailling list.