To enable the NetBilling gateway:

1. In the AspDotNetStorefront admin console, go to the Site Configuration Wizard page.

2. In the Payment Gateway section, click the 'configure' link next to the NetBilling entry.

3. Put in the value you obtained from NetBilling for the 'Account ID' and 'Site Tag'.

4. Click 'Save and Close'.

5. Finally, click the radio button next to NetBilling and then click the 'Submit' button.