Changing the start and end time of an existing class

Example if you wanted to change the Vinyasa class Start and End time you would click on the Vinyasa class and select 'Modify Class' then select 'Recurring Class' then change the Start and End time and then remember to select the 'Update All Occurrences' box and then click save.  That's it.  This will update that Start and End time going forward.  :-)