Video Demonstration
For OpenCart 2.3.x.x and higher version the module is found under Extensions > Analytics > Adwords Conversion
For Opencart 2.2.0.0 and lower version the module is found under System > Settings > Edit > Adwords Conversion tab
For OpenCart 2.3.x.x and higher version the module is found under Extensions > Analytics > Adwords Conversion
For Opencart 2.2.0.0 and lower version the module is found under System > Settings > Edit > Adwords Conversion tab