If you wish to display a login form for users that have created an account during registration (or any other time), Easy Digital Downloads includes a shortcode for doing so.
This shortcode will display a simple login form. It should be placed on the page that you wish to act as the login page:
Upon form submission, the customer is redirected to your Purchase History page.
Additionally, the shortcode also accepts an optional redirect parameter that lets you set where users are redirected after they login. This option takes precedence in all cases. It will over ride the main setting under Settings.
When someone is logged in the text "You are already logged in" appears instead of the form.