I have enabled custom HTML Able to create Blog with images etc.

However the Social Media Sharing plugin needs help to assign the og:image.  All the articles I read online say just to add the Facebook page tags in the html.  Such as:

<meta property="og:image" content="the_location_of_my_image.jpg" />

My question is how can I add this. I have tried inserting the html code as part of the blog in html insert, but no effect. Still is using my default og:image Is there a certain location in HTML of the blog that they need to be located.

Thanks