Hello William, I also bought the 3870K APU for a build, I have the ASUS F1A75 V-EVO mobo so don't know your bios setup. Bios is the place for you to make the changes. I'd suggest that you make small changes to the Multiplier first - stock is x30 this can be increased - the bus speed of 100Mhz is also set as stock - this too can be increased, get a feel for stability of say x33 Multiplier that leave you at 3.3Ghz. Making changes to the 100Mhz bus spd will however have affect on your RAM spd, due to this effect I have left the bus at 100Mhz. The 3870K can get to 3.8Ghz in my build but I prefer to relax it to 3.5Ghz/ 3.6Ghz saving from higher temperatures and I wanted 3.5Ghz.
Read Tom's Hardware advice for Overclocking Black Edition AMD Processors; you've got an APU but this is technique used on unlocked AMD processors - great advice, helped me out. Small steps William as you don't want to end up knackering the thing. Read the link first;
http://www.tomshardware.co.uk/forum/274820-11-black-edition-overclock-raising-multiplier-guide
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