To track conversions resulting from your advertisement, you must create and place a conversion pixel then associate it to the Line Item. To create and place a conversion pixel see here: Conversion Pixels. Once a Conversion pixel is created at the Advertiser level, it will appear at the Line Item level. To associate the conversion pixel to the Line, select ‘Associate Pixels’ and a window will appear with a list of the conversion pixels under the Advertiser. Click the green plus sign next to the pixel name to associate the pixel to the Line.