Step 1: From the toolbar, click the menu item "Tools" then click on "Preferences".

Step 2: The Opera Preferences dialog box will open up. Make sure you are on the "Advanced" tab and click on "Cookies" in the left hand menu. Click on "Manage Cookies" to open the cookie manager.

Step 3: The "Server manager" dialog box will open up. This will give you the option to remove individual cookies. Type in the poker room that you wish to join (in this example we have chosen Full Tilt). You will see all the cookies from the Full Tilt domain appear. Highlight the domain of the poker site and click on "Delete". It is important that you delete both the www domain and the domain without the www (ie. both www.fulltiltpoker.com AND fulltiltpoker.com).

Step 4: After you have deleted all the cookies associated with that domain you are ready to continue. You can now close the dialog boxes and continue with the registration!