Go to the yellow 'Children' icon and click on 'Sessions'.
Go to 'Delete' and click on 'Sessions'.
1) Choose if you want to delete sessions between two dates, all sessions after a selected day or all sessions before a selected day. Tick the box next to the relevant one.
2) Enter the date/dates for the deletion of sessions.
3) Click Next.
The column will then open on the right hand side of the screen.
Check that the information is correct and press Finish.