G'day, you'll need to read the codes first. Then you can reset them if it is nothing serious.
Above info may apply to your model and diagnostic connector may look like the one in the photo which is OBD type but yours could have grey Consult type
Or alternatively you could purchase appropriate ECUTalk cable and use software supplied with on your notebook/laptop to do it easy way. I thoroughly recommend you to go this route as the ECUTalk is invaluable tool. I'm guessing from you avatar pic that yours is non CrD model (On CrD or common rail diesel all this info doesn't apply.)
ECUTalk
cables interface
Cheers