HRM.. do you know how to set it up?? help :/

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Okay.. I wanted a HRM for Christmas so bad!! I got it.. which is great.. but I can not figure out how to make it show me how many calories I am burning.

My HRM has a chest strap and a watch that I put on. I know how to make it show my my HR and I have even put in my weight. I have read the manuals that it came with like so many times and can not find the answer. Their online support was not very helpful. No I have not called, but I hate calling big companies bc it is usually not a real person.. or a person that can understand english

I have a TIMEX not sure which one.. the strap says TMXM640.

Please help! i really want to know accurately how many calories I am burning.

i am really hesitant on posting a topic.. bc i feel like more ppl bash on the person more than actually help.

So PLEASE only post if you can help me! (remember.. if you don't have anything nice to say don't say anything at all)