How do I program my ml320 key?

i got it from the dealer but they all acted like they were too busy to help me with my little key.can I do this myself??

No, the dealer has to do it.

I do not know if that is possible. Did it come with your car or is it a replacement?

no, you need star diagnostic to program the key mercedes computer only availiable to mercedes technicians. go to a different dealer if you have a problem, shops do get busy, that is how they stay in business.