how to add commend box on divi wordpress?

I am working with Divi. I would like to add commend boxes to my web side, but it
dosen´t work the normal way with the wordpress instructions. If I go to pages – options – tick discussions. And than down the page tick the boxes for discussions and than nothing happens!! How do I get the commend boxes activated on Divi pages?
Would be great if someone could help!
Thank you!