http://mzuwmshghgw52tqwb7clnlew3a57srxdaxjqtlll2cnz2jsh5wuiqjad.onion/howto
If you prefer to use online exchanges, here are a few: http://www.binance.com <--- available worldwide, and a US version exists for US Citizens. http://www.bitstamp.com <--- available worldwide, but best working in the EU region http://www.coinbase.com <--- available worldwide http://www.zebpay.com <--- mostly for the Asian, Indian markets and of course, there is the http://paxful.com site, if you prefer dealing eye-to-eye with a real person.
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