This is not the right place to ask this question. Anyway, this is how you would need to do this:
1) Open BI LaunchPad (Or InfoView)
2) Right-click the report > History
3) Highlight the Recurring Schedule (Not the Instances)
4) Click 'More Actions' > Reschedule
5) Change whatever you wish to and then click the 'Replace' option on the Left Pane
6) Then Select 'Replace Existing Schedule'.
-Abhilash
