You can charge for featured ads which then allows the ad to be shown in the featured ads slider. It does not change the colour or other status of the ad itself. By default, ClassiPress requires users to be registered before they can place an ad. If you wanted to allow posting without registration, it would require customization of the default theme on your part as there are no settings for this in the ClassiPress admin dashboard. The theme is secure, with options to set back office access as well as a reCaptcha field for registrations. Thanks.