You can use key codes. To learn on how to use this go to your power tools tab for very clear instructions. Once you do that, use note pad to keep track of your ads with each key code of what you're advertising. Then you can go to hit tracking on your power tools tab again. Here you will see which ads that's gaining clicks. Then you start receiving your sign-ups, the key codes will let you know which ads is providing the best results for you.