[Plugin: WordPress SEO by Yoast] Check box for 'nofollow'?

Hi,

My external links need to have ‘nofollow’ added to them. Can someone tell me where to in YoastSEO to do this?

I have looked for a check box somewhere but can’t find one. Apparently this option is available on Yoast.

With thanks

https://www.ads-software.com/extend/plugins/wordpress-seo/