To open an account at Coinbase Pro, simply follow the account opening link and instructions here.
For any help during your Broker account opening/verification process you can get help here.
Once your account is opened, on the Coinbase Pro website simply click on settings bar on the top right of the page then "API" to generate a key.
Match all the settings below (You can make the passphrase whatever you want):
Once you've made the Key, make sure you save the API Key, API Secret and passphrase to link to White Shark Trading through Add Account.