You can choose to do it one at a time, or in a bulk process:
To delete in bulk:
• From the left sidebar Manage -> URLs -> check the checkboxes near the URLs you'd like to delete.
• Click the Delete button at top left.
• You can also do it from the URL View: select the URLs you wish to delete -> from "Bulk Actions" menu -> Delete URLs.
To delete one URL:
• From the left sidebar Manage -> URLs -> under "Actions" click the trash bin icon for the URLs you'd like to delete.
• At the Edit URL page, click "Delete URL & Terms" (red button) at the top-right.
• A confirmation box will pop-up.
• Click OK to confirm.