Here is the website to download the software for it.
http://arduino.cc/en/Main/Software
the software got some examples like LED blink , LCD display , servo comtrol in the sketch. go to files at the top an you will see examples , scroll across in basics & you will see blink.
here is one blink sketch for LEDs code.
every time you create a sketch or use a sketch you have to verified the code first before uploading to the chip. see the green circle button with a tick in the middle , click that first & after it is completed the verified then click the next green button beside it with a arrow pointing right to upload. but make sure you go into tools at the top & make sure everything is config with the serial port setup with the usb & your board setup an select arduino UNO. hope this helps a little to get you started.:thumb:
If you need any more assistance with it i can guide you. but be in mind the sketch can be tricky at times to get it right. & the codes has to correspond with the pin layout on the IC. like Gnd , power , source in , source out , A0 to A5 from analog in & the digital out pins.