Is user premium adds:
All the configuration is done through the shortcode parameters.
The shortcode will display either:
For the PayPal button: Some currencies (usd, eur, jpy, cad, aud) are supported. Various languages are supported and most buttons are supported.
Note that the shortcode will require some parameters, such as the merchant email, in order to work properly (see the plugin settings page).
Simply put the shortcode, with the desired parameters, in the page that you want to use as subscription page.
You can see (and edit) the subscriptions expirations in the users management page.