my 2011 escape v6 threw a check engine light the other morning so I took it to Autozone to have it diagnosed,it came back as a (o2 sensor Bank 2,Rich to lean). can someone tell me which side is bank 2 ,thankyou

 

Bank 2 is the one in the front of the vehicle. Sensor 2 is the second sensor if you start counting at the exhaust manifold and follow the exhaust.
Do you just want to replace the sensor and hope that fixes your code or do you want to provide the code which autozone found and receive recommendations for diag based on the code?
If you choose to simply replace the sensor, I would recommend motorcraft or denso personally.