Signing up as an affiliate merchant is only the first step in improving your sales--you also need to make sure your web site is ready to direct and guide people after they've clicked on a link from your merchant affiliate.
Help your merchant affiliate by having attractive and functional ads and creating landing pages to go with them. Test different versions of the landing pages and see which convert more visitors into customers. Set up two different landing pages and send half your traffic to one page and half to the other. Then, compare conversion rates to figure out which page performs the best.