Once you've published your website, you'll want to share it with the world. This usually involves sharing a link to your site across different channels, such as WhatsApp, Facebook, Instagram, Twitter, etc.
Sharing this link automatically shares a thumbnail of an image from your website. You can choose which image is shared per page, via the page settings.
In the Editor, go to the Pages tab.
Click on the settings (gear) icon next to the page you want to edit.
Click on the SEO settings link.
In the SEO settings, click on the Upload image button to upload your social media image.
Click on Save.