I don’t see index and follow in the meta robots tag
You’ve written a post and configured its Advanced settings in the WordPress SEO (Premium) metabox, like this:
However, when you look at the resulting source code for your post, you do not see the meta robots tag.
<meta name="robots" content="index,follow"/>
The sole reason;
index,follow is the default meta robots setting, thus there’s no need to explicitly add it.