Select Direct Payment methods from the Payment Gateways page.

Scenario - Enabling a WorldPay account

In the Create Listing page, scroll down to Payment Methods to see available (not all available methods are also enabled - see below) Direct Payment methods:

To enable WorldPay select it, check the Click here box, and complete the credentials menu:

Confirmation screen:

Alternative Method

Complete Direct Payment info (one-time process) from the Account Settings (Home -> Members Area -> My Account -> Account Settings) menu: