@adamprocter There's a bookmarklet and two extensions, as well as the website itself for creating the embed. Micro.blog hosted blogs should all support the embed without any extra work.
The other way is to go to your Micro.blog Bookmarks on the web and use the "embed" button.
And finally, if you're not using a Micro.blog hosted website for them then there's a good chance you can host Quotebacks yourself and integrate that way. The website has information for doing that.
Note: the Micro.blog timeline does not support the embed so it'll look like a title-less post with no obvious sign that you're quoting somebody else.