To Edit your Subscribers, go to your account settings by clicking on the arrow next to your username on the top right corner. Then click on the Subscribers on the left side panel.
Once on the Subscribers page, locate the subscriber you wish to edit can click on the Edit button under the Action column.
You will now see the same options as when you add a new subscriber. You can choose to deactivate the subscriber by choosing the Inactive option from the drop-down menu or you can deselect the reports the subscribers wishes to stop receiving.
Remember to save your changes!
If you need a refresher on how to add new subscribers, click here.