Access the time entry from the Time Tracking tab in a project or the Time Tracking Report under Reports
Click the Pencil Icon on the time entry
Make the edits
Click Update
Important notes:
If you don't see the pencil icon, then the owner or admin on the account will need to give you permission to edit time entries.
You cannot edit/change the client or project associated with the time entry. You will have to delete and manually recreate the time entry.