how to turn off default of checked box for email notifications ?

[Fast68Chevy]

how can a person make that default stop, dont need email notification on this size and active of a forum, i use the feature on other forums, but are lots smaller and lots less traffic, so its great for them, but not so much here, my inbox would be completely overloaded with emial messages, its a pain to uncheck the box every post and reply,,..

thanks for anything,