Use Open Graph meta tags inside the <head> of your document(s).
https://developers.facebook.com/docs/sharing/webmasters
Example:
<meta property="og:url" content="https://ace240z.com/transmission-swap.html"/>
<meta property="og:type" content="article" />
<meta property="og:title" content="Swapping a transmission" />
<meta property="og:description" content="Put a 5-speed transmission into your 240z" />
<meta property="og:image" content="https://ace240z.com/images/Ace_240z__Transmission.jpg" />
<meta property="og:width" content="600" />
<meta property="og:height" content="600" />
Width & height are in pixels. FB recommends using square, 1:1 aspect ratio images, no less than 600 pixels wide.
NOTES:
1. It's important to rename your files without special characters and spaces. Underscores _ or hyphens - are acceptable. Spaces & special characters (&^%$#) are reserved for programming instructions and should never be used in file names.
2. You have numerous code validation errors that need attention. See details below.
https://validator.w3.org/check?uri=http%3A%2F%2Face240z.com%2Ftransmission-swap.html&charset=%28detect+automatically%29&doctype=Inline&group=0
3. Your site should have an HTTPS protocol. Ask your hosting provider for details on how to force your URL to resolve to the secure server. See results from Why No Padlock below.
https://www.whynopadlock.com/results/12b7129b-2dbe-48c4-a881-cd54efcb4505
Hope that helps.
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