How can I change my screen size?

This is what I need to do: Your screen size of 1170 x 702 is small and may result in display issues. We recommend 1024x768 or higher.



I went to control panel but cant really figure it out where do I have to go?



PLs help, i want to finish this today!How can I change my screen size?
Left Click the Desktop and click Properties (Personalize on Vista) and click settings then slide the slider



not sure if its the same on Vista