If you have a Coinbase account, you have access to its backend exchange called Coinbase Pro, formerly known as GDAX. You can log in here with your Coinbase username and password.
Make sure you add Two Factor Authentication to better protect your account and funds!
If you don't have a Coinbase account, you can get 10$ worth of Bitcoin for free when you sing up with my invite link. https://www.coinbase.com/join/57ed6a1cc1c7780079c46461
Try to keep your money out of central banks! Crypto exchanges offer a great alternative, however it is up to you to manage your own finances. Life starts at the edge of your comfort zone..
Not investment advice.. Bitcoin could shoot to $100,000 tomorrow... Join the ride or sit back and watch..
Pat Leach
Instagram: @thestateofanarchy
Website: http://thestateofanarchy.com/
YouTube: http://bit.ly/TheStateofAnarchy
Statebook: http://bit.ly/TheBookofAnarchy
Steemit: @SonnyMazzone 
Bitcoin: 17w77NVmtTxj78d1Dnx3vh5FjwHvzpkts8
Bitcoin Cash: qzvxljvm82hywnrsdv6vqd9m2zjj207y65fc04f2w5
Binance: 0x49e06218d5D05923F0e442265cD2A419D4d17C4D
Dash: XqVzxHF6wi1F9uA8vc8hhWZFyqLgjZCbH7
Ethereum: 0x49e06218d5D05923F0e442265cD2A419D4d17C4D
Lisk: 13974177123382109591L
Ark: ALVqR9qiEwRbHBcZ7kuw5Xwqqzd4nXSMDc
Monero: 458xXh879UPVHNjDmShgPXPtHbYdCVBSE5L5kZ1CnJYuMGLNqZiGPqB9XDSms5RqVBjHNfgxMfo6d6oNjFYKEG1iA7UmRp3