Step 1: Open Safari.
Step 2: Click Safari on the top menu and select Preferences from the drop-down menu.
Step 3: A dialog box will appear. Click Privacy, located at the top of the dialog box. Deleting cookies can result in faster computer performance and increased browsing security.
Step 4: Click Manage Website Data...
Step 5: A dialog box will appear with a list of cookies. Click the Remove All button or select cookies individually if you do not want to delete all of your cookies.
Step 6: When the Are you sure ...? confirmation message appears, click Remove Now.
Step 7: Click Done.