To start with, that is I believe the default forum setting, you get email notification for topics which you create or contribute to. So you shouldn't have to change your profile settings.
As Tarq57 mentioned there is also the Notify buttons on the page of each topic.
If you still aren't getting emails than it is possible that your ISP or your anti-spam are blocking them. I believe that all emails from the forum come from the asw.cz (Alwil SoftWare, Czech Republic) so ensure that domain isn't blocked.