1.) Goto the create GTT API report url section:

2.) select WDC as target and prepare your required query; copy the URL into the clipboard

3.) open your Tableau Desktop/Server and go to the Web Data Connector section:

4.) paste the previously copied GTT WDC URL and press <enter>

5.) supply your GTT userid and password within Tableau

6.) go to the bottom of the Connector and hit the Get Global Trade Tracker (GTT) Data button

7.) update/get the data

8.) ...and see your data magically appear within Tableau :-)