The instructions are posted in like the second post of this thread also the instructions are in your owners manual.
OP did you buy the correct key? Just because the eBay add says it works with your car does not mean it is the right fob, I could never figure out why my key fob had the buttons switched around until I was doing some searching and found out that I had the wrong key fob. Your car has 2 options for the keyfob either the 3 button part number 10246216 or the 4 button part number 10246216.