You can ensure that user advertisements are approved directly from the system or approve the advertisements after checking them. To this end, you need to make certain arrangements from the section Options Panel > Frontend Upload System > Upload Settings > New Uploaded Item Status.
If you have chosen to approve user advertisements, you will be requested to approve this advertisement after each advertisement uploaded. If you do not, the member will not be able to publish advertisements even if (s)he has right to post. You can see if this membership package is valid while giving this approval from advertisement editing page.
If you have chosen to publish user advertisements directly, advertisements will be published directly before being submitted for your approval.