Just have to add all the necessary meta tags to the landing page or landing page template. You can add meta tags in the Landing Page editor if you click Edit Settings. Alternatively, you can obviously add whatever code you want to the LP Template.
I tried to add the code <meta property=”og:image” content=”www.example.com/image”/> in both the meta tag settings and in the email template, but it continued to display the original header image (which is stretched out as an open graph) when posting landing page url to linked in. Where in the template would this code go under ?