Hi Johnny,
You should contact them to follow up. When signing up with a network, make sure you are providing them with as much information as possible. For example, how you drive traffic, the target demographic of your Website, and what offers you plan on running from them. Networks have an approval process which reviews affiliates based on media types, relevancy, and promotional plans. If you provide them with sufficient information, it will help the AM's decision of approving you. Help them understand that you will drive quality traffic to their offers.