Open the Preferences dialog box by clicking "Safari" > "Preferences".
When the dialog box appears, click the "Security" icon. Click the "Show Cookies" button at the bottom of the second grouping of preferences labeled "Accept Cookies."
A second dialog box will appear showing a list of all the "Cookies" stored currently stored in your copy of Safari. From this box, you can select the "Cookies" you would like to delete.
Highlight the "Cookies" you want to delete. Once selected, click the "Remove" button in the lower left to remove your selections.
You can also click the "Remove All" button at the bottom of the box to eliminate all the "Cookies" in your list.
Click "Done" at the bottom of the box when you have removed your preferred "Cookies."
Click the red circle in the upper left corner of the Preferences box to close it.