Delete time entries in
My Times and
In both lists, a time entry can be deleted via the options menu:
Delete time entries in the 'Add time entries' dialog
In the popup of the time recording a couple of your last recorded entries are displayed when you click on the arrow down button. That's where you can quickly delete your entries, as well.
Currently, time entries can be deleted (and edited) by all members of the workspace. As soon as we release permissions and approval processes for time tracking, new restrictions may apply.