please, can you explain to me how I can buy the token when it goes to market
With what kind of currency can I pay?
just Bitcoin (BTC) and Ethereum (ETH). using your BTC/ETH you own, send your BTC/ETH to address has been provided.
like a sinergia message :
don't send money from exchanger send a money from your wallet where private key you own
Can citizens of the USA participate?
I don't understand about US regulation of cryptocoins and ICO. but sinergia ICO does opened for everyone