There is a couple of ways to accessing your display settings.
1. Right Click anywhere on Desktop except on Icons. Goto Properties and a table will display with some tabs on it for options.
A. here u can setup your themes, desktop settings, screen saver settings, appearance, and screen resolution.
2. Another way is to goto Start, Control Panel, Appearance and Themes, one of the top options or the Display option. This will bring up same table as listed above.
3. If you have your Control Panel to show in My Computer Open up My Computer find the Control Panel Icon and follow the steps listed above.
If I have left any way out please feel free to leave comment with additional information.