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You can buy on Bittrex.com or another exchange that lists them. You will have to use eth or btc, likely, as I don't know of a site that sells it for USD.

I dont have btc and eth so what should I do

You can buy btc or eth on coinbase.com with US Dollars/other national currencies. :)

Ok thanks for your support and help really appriciated

Sure thing! :)