In the top menu on any Rendo page, select Forum -> My Forum Options.

Scroll down to the list of Forums, untick the 'Notify' or the 'Visible' button for forums that you do not want any notification for, or you do not want to see, and then click Save changes.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)