Nitrosell is integrated with the Google Display Network (GDN) which uses your normal Google Analytics ID. If you want to include Google (DoubleClick) display advertising on your site, Google will send you code like this to insert on your site
<div style="display:nonne;"> <img height="1" width="1" style="border-style:none;" alt="" src="//googleads.g.doubleclick.net/pagead/viewthroughconversion/1099999264/?value=0&guid=ON&script=0"/> </div>
To insert this on your site, go to WebStore Manager then select Marketing from the top Menu and select SEO. Near the end of the page, you will see:
Update Your Analytics Tracking Code to Support Display Advertising
Tick the Box and your setting will be saved.