Changing the method of notification for subscribed topics

[SinnyROM]

I have a growing number of subscribed topics and each time a reply is made I receive an email notification. From the FAQ it says I can change the preferred method, but I can't locate it in the Control Panel.

The options that seem close enough but not quite are:
- Board preferences > Edit global settings > Administrators can e-mail me information
- Board preferences > Edit posting defaults > Notify me upon replies by default

I also noticed on the Manage subscriptions page there is an incomplete sentence in the description, so it's possible this isn't fully available:

Below is a list of forums and topics you are subscribed to. You will be notified of new posts in either. To unsubscribe mark the forum or topic and then press the Unwatch marked button.

At the moment, is it possible to change the method to private messages instead of emails?