you could always use the "subscribe to this thread" option. in "thread tools". set you notifications to send you email notifications.

that might get kind of annoying. most forums gave some type of rss feed built in and it's just a matter of finding it and adding it to some type of rss reader app. haven't looked at BF but since it's built on a up to date version of vbulletin it's probably there somewhere.

and the app they are talking about below "tapatalk" might will probably let you subscribe to particular sections of a forum. didn't care for the app myslef but it seems to be pretty popular.