How to be a trader:
1. Buy some btc, via sites like Coinbase[1], Gemini[2], etc depending on your country
2. Send over the BTC to exchanges like Binance[3] and Bitfinex[4]
3. Pick your trading pair(BTC/ETH, BTC/SC, BTC/COSS, etc etc)
4. Trade

Now the actual hard part is how to be a good trader. How do you learn the basics? Read. Hit up Google. There are lots of good free information out there.

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[1] https://coinbase.com/
[2] https://gemini.com/
[3] https://binance.com/
[4] https://bitfinex.com/