Login To Your KuCoin Account
Click on the "Trade history" tab on the left hand side of your Assets page.
Enter your desired export date range into the Time input and leave the other fields set to All to download your complete trading history. Click on the "Export to CSV" link and wait for KuCoin to generate your report.
Upload your trade history file into the Kraken tab on Step 2 (Import Trades) and click the Import Trades button.