To add Open Graph (og) tags:
1. Open website in edit mode and click Settings.
2. Click SEO.
3. In the "Meta tags" section select "property".
4. In the following field enter OG tag type. In the "content" filed enter your text.
For example:
To enter website's title, in the "property" field enter: og:title.
In the "content" field specify your website's title.
To enter website's description, in the "property" field enter: og:description.
In the "content" field specify your website's description.
To add an image for your Open Graph tags, in the "property" field enter: og:image.
In the "content" field enter the image's link.
5. Click Add.
6. Click Save.