Erasing an entry in the sent log
The sent log allows you to revoke any link by right-clicking on the entry in the sent log and clicking Revoke Link. This will simply deactivate the link, but not remove it from the sent log so that you will always have a record of everything you ever sent out.
Once you click Revoke, the entry mode icon will turn to locked and the expiration date will record the exact time you clicked revoke.
If you want to not see it in the Sent Log, you can click Hide Expired, that will temporarily hide any expired Links.