Click on settings, then, depending on how you saved it, click on either "bookmarks" or "subscriptions" on the left of next page. Find the one you want to change the notification type on and put an checkmark in the box to the right of it. Then scroll down to the bottom of the page, and click on "selected threads", and in the box that pops up, you can delete, move, or change the settings. Pick your choice, then hit "GO". That should do it.