How can I make CamStudio's recording screen larger.

I want to record a large screen and I see where it says "dimentions", but I can't change it while recording. How would I go about changing it. If I can't change it, what free recording program do you recommend?

You have to select the dimensions before you begin recording.

The size of the screen you are able to record depends on the capabilities of your system. It's usually a tradeoff between the size of the region, the number of colors in the display mode and the frame rate. You can't always get it all.