Easiest way to change screen resolution/fullscreen settings

[Oddball]

open your stream folder for heroes and look for graphic settings (application). double click and your first option will be for resolution setting. just below it is box for fullscreen. pick resolution you want, check fullscreen then click save and exit. works fine on Win8

[Mau]

It wont let me change certain boxes, what do i do in that case?

[Flaminius]

It worked fantastic! Thank you!