Follow these simple instructions to download the csv file from your Coinbase account.
Login into your Coinbase account and click on the profile icon at the top right
In the dropdown menu click on Statements
In the new page inside the box Generate custom statement, select as follow:
Asset, All assets
Transaction Type, All transactions
Date, All time
Format, CSV
Now click on the Generate button
The csv file will appear shortly after in your Coinbase statements page
Now go back to CryptoBooks and press the Add Connection button on the Connections page.
Select the Coinbase icon by filtering the list usign the Exchange CSV tab or digit the name in the quick search box
Select the CSV connection type from the drop-down menu, then press Next step
Give the connection a name of your choice, choose the default category and press Next step
Press Select file to import your file, then press Upload file and import transactions
Done! The synchronization between Coinbase and your CryptoBooks account has just begun!