Oh! It's very simple my friend, just deposit your tokens or dollars in an exchange that you want to use like Binance, Okex, Bithumb, etc... then, after that you successfully deposited your funds, you can start trading right away. But of course always be careful and just start trading with small amount first while learning and getting experience. It's easy to say that trading is just a "Buy low, Sell high" but the fact is, it is too risky that's why much better if you learn first about trading even just basic.