I'm having trouble trying to pinpoint your monitor, but here is an AOC example.
http://support.aocmonitorap.com/userguide/f22/English/v-04.htm Scroll about 40-45% of the way through the information and look for the orange title "Function Control Illustration" which will have a chart that shows what options are where. The option you're going to want to be looking for will have an image of the screen with directional arrows. Under this menu you should be able to adjust the height and width of the picture (moving it up, down left or right). Similar instructions can be found here
http://us.aoc.com/support/documents/pdf/documents/564 and starting on page 17 with the HotKeys (It'll be under the menu key).
Hope this helps some more. I try and make posts while I'm at work, so if you need more help, you can always try and contact AOC directly
http://us.aoc.com/support/service_centers or http://us.aoc.com/contact