If an advertiser does not have a group, prefix or account set up, please contact Client Success who can assist you to make sure everything is set up properly.
If you already have access to one or more of these items (group, prefix, account), you will need all 3 of these items set up and they also must be associated to each other, in order to create codes.
If you are unable to either create codes or purchase credits, please contact Client Success for assistance.