Featured image issue - Sydney

How do i choose a featured image that will appear as a thumbnail when i link my website to sites like facebook.

like this for example
that default image appeared
but i changed that to something else and that image still appeared when i linked my page to my post
Thanks =)

Hello there,

You can use the YOAST SEO plugin. See this article which explains how to do it (go to “Explicitly Tell Facebook To Use Thumbnail of Your Choice” section).