They can enter the username and password via our standard sign in dialog to authenticate. If you need to something special for them to register we have a "Create account" link in the dialog that you can point to a website to collect the necessary information to create their account.
The DPS configurator is for creating custom storefronts and libraries for use in DPS classic. Cards and Layouts in DPS 2015 offers similar flexibility with a lot of additional options for displaying articles and collections.
So, to be clear, i have a suscription business model that does not use, Google or Apple suscription system. I need the user to sign up with some specific info. Can I have an external Sign up form? or can i customize the sign up dialog? It doesn't matter if the user has to login through the provided Sign in dialog. But, i need the user to suscribe by entering some specific info, through a provided sign up dialog or an external own sign up page. Can i achieve this in DPS 2015?
One clarification: you can't actually pass a login back from an HTML page back into the viewer. Right now in DPS2015 the only way you can offer entitlement sign in is via our provided sign in dialog. We do hope to offer more options to customize the sign in experience in the future.