Send him a message. Since you rated, you can't ask for a revision via the revision button, however you can send a message to your designer via the inbox. And he should still provide you with the changes. If not, you can escalate to customer support, but for the time being, contacting your designer is the best bet. See how they reply, if they assist or not, and go from there. If the designer is an honest, hard working professional, they will change the way you asked, especially considering the fact you also tipped them...