BidVertiser tries to make it easy to track your ads in order to optimize your performance. In order to track the ads, you must have some analytics software operating on your site, something like Google Analytics. Some services such as Clickbank can also integrate with tracking parameters.
The idea behind tagging your ads is so that you can track which traffic sources your clicks are coming from, which search terms are being used, if a conversion is achieved, and which ad was used. These can then allow you to identify poorly converting traffic sources, and blocking them (more on this in another article). It can also help you identify the best keywords for your campaigns.
You can access the options by clicking on: Destination URL Macros: in the Edit Ad window.
This option shows the different parameters you can use for tracking your ads, again, please make sure any updated URL functions correctly.