Open a web browser on your computer and go to Diners Club's online account management log on web page (see resources).
Enter your Diners Club user ID and password and click the "Log in" button.
Click the "Club Reward Points" link.
Select the option to "Transfer Club Reward Points" and then select "Delta SkyMiles."
Enter the number of Diners Club Reward points that you want to transfer. You can transfer points in 1,000 point increments.
Click "Submit" and confirm that you want to complete the transfer. The points will typically appear in your Delta SkyMiles account in approximately three to seven business days.