plugins/require_auth_to_comment/views/profile-editor-extras.html.erb
<h2><%= _('Comments') %></h2>
<div>
<%= labelled_check_box(_('Accept comments from unauthenticated users'), 'profile_data[allow_unauthenticated_comments]', true, context.profile.allow_unauthenticated_comments) %>
</div>