There is no "fast" answer for how to overclock. You're gonna have to do research and learn how to overclock if you want to get started with stuff like this.
For overclocking any of the R series watch youtube videos. Or you can type in how to overclock "enter your GPU" and see what pops up it is really best if you learn how to do it on your own so you don't screw anything up.
Overclocking by looking at a quick get will get you to fry your card. You really need to read alot of guides/watch tutorials, understand it, then move on to doing it.
Here is the AfterBurner link http://event.msi.com/vga/afterburner/download.htm Easiest but most basic method for a simple OC