If you ever need to add, change, or completely remove the schedule for a backup set. You can do this inside the Portal.
Navigate to the account you wish to change this for and select the "Edit" cog for the set.
Go to "Schedule" on the left, on the right you will see the details of the schedule you have in place.
If you want to edit the schedule, select the schedule (as you can have more than one) and select "edit".
From here you can change the name, edit the time it runs and set time restrictions. When done press "save" on both this window and the next.
To delete the schedule you just select "delete" after selecting it.
And then use the slide button on "enable scheduler" to turn it off. When done press "save".
To make a whole new schedule press "add" and select the type of schedule you would like.
When created press "save" on both this window and the next.