If you didn't buy retail CPU, then the mobo manual will have instructions in it. Really simple process, especially with the stock HSFs from AMD. When you start upgrading to huge HSFs like the Thermaltake XP-120 or the Zalman 7700, then you start getting into a little more difficult mounting procedure.
What HSF are you using?
<font color=red>You're a boil on the arse of progress - don't make me squeeze you!</font color=red>