shared featured image of the Front page in Facebook

Hi,

So currently I'm setting my Homepage by using "Your latest posts."

However, when I share my homepage on Facebook it just shows my website logo.
I'm wondering how can I change this.

It looks like the image below,
https://developers.facebook.com/tools/debug/sharing/?q=https%3A%2F%2Fwww.ketothailand.xyz%2F

I want to insert a better image rather than that one.

I want to be able to change it to look like this
https://developers.facebook.com/tools/debug/sharing/?q=https%3A%2F%2Fwww.ketothailand.xyz%2Fpink-salt-better-than-regular-salt%2F

However, I am not sure where does your theme keep the "homepage" so I can't manually insert my image via the Yoast SEO plug in.

Thanks