Logging to a DotNetNuke (DNN) site with either username or email is not supported out of the box. Here is a simple way to do this. First, make sure the membership provider in your Web.config is set to require unique emails when creating accounts. You'll find this on this section of your Web.config: add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="SiteSqlServer" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false"...

One of the worst documented features in DotNetNuke is the native role subscription and the integration to PayPal. After hours of Googling and trying several things, this is what worked for us. You'll still need to make sure to set the payment settings in the 'Site Settings' > 'Advanced Settings' > 'Payment Settings' (the processor userid is the email for the PayPal account you are using and the password can be left blank) The DNN page that redirects to PayPal located under WebsiteAdmin/Sales/PayPalSubscription.aspx...