How to include cover photo in a message

How do I show a book cover in a message I am creating in a talk?

>1 JoeB1934: https://wiki.librarything.com/index.php/HelpThing:Html_tips#Inserting_Images

e.g. is the thumbnail from this image location: https://images-na.ssl-images-amazon.com/images/P/B0863YPPMQ.01._SY110_SCLZZZZZZZ...

If it is on your computer and not online, upload it to the Junk Drawer part of your Gallery (same place you upload profile photos, just pick the Junk Drawer from the drop down before you upload it). Or if it is your book, just add it as a cover :)