You can easily batch edit your time entries (for information on time entries click here).
Please follow the steps below.
1) Click on "Time Entries" in the top navigation bar.
2) Select the time entries that you want to edit.
3) Click "Items selected" and choose "Edit".
4) Select the items you want to edit by toggling their buttons to "Yes". Before saving the changes make sure the check box on the bottom is selected.
What happens now?
The edits you made will have been applied to the all the time entries that have been selected.