We don't follow you well. There is some confusion. At first, you said that you'd like to hide the Comment section, then you ask us to provide a code for hiding the Answers section. 

Below is the CSS code that allows you to hide "Your answer" section with the editor. The CSS code should be added in the "Custo CSS code" textarea, locate in the Dashboard > Forums > Settings > Styles admin page:  

#wpforo #wpforo-wrap .wpfl-3 + div + #wpf-form-wrapper {
    display: none !important;
}

However, this is not recommended as, in this case, you'll not be able to edit the topic as far as the editor is already hidden. 

How do I turn off comment?

I'm using Q&A format to allow people to vote on an issue and make comments. But I don't want them adding answers.

Is there a way to do this? 

I've hidden the Answer button and other things with CSS but I can't figure out how to change the form so that it only allows comments. 

Tks!