Meta tags (quick) settings - Detach option

You need to visit 'manage fields' section of appropriate entity.
For path-based meta tags it is one of configuration tabs, for nodes - content types configuration etc.

And how do you remove them from comments?

Thanks,

-=Sal=-

admin/structure/types/manage/page/comment/fields
(replace 'page' with your content type name)

And how do you remove them from path-based meta tags?

Thanks,
Shannon