For example, if you use text links, make them a different color, size, or style. If you use images make them big. And put them in obvious places. Personally, as web surfers ourselves, we don't like them. But the decision is yours.
Links placed here have the highest response rates.
Make sure that a user with a 640X480 screen will see the advertisement in the initial field of view. Although the reasons are not clear, it may be related to the fact that the buttons on dialog boxes and forms are generally located at the lower-right.