Paste in your code then highlight it and choose the appropriate option here...
It will then add the appropriate tags on either end...
and your code will be like this when you post
Gigabyte P67A-UD4-B3, Intel Core i7 2600K, 16GB Corsair DDR3, EVGA GTX 970 SC, Win7 Pro 64-bit SP1, Primary monitor @ 1920x1080, secondary monitor @ 1024x1280