To keep it really simple, all you have to do is left click on the down arrow at the top left corner of your post, and select emebed.
Twitter, for example makes it super easy to embed Tweets into websites by allowing you to paste a quick snippet and walk away.
See how easy it is to embed a Tweet:
Elite Strategies t-shirts are in! Children’s version pictured here more to come. http://t.co/oR7680ACb9
— Elite Strategies (@delraybeachseo) September 8, 2013
One of the (many) reasons so many people are using Twitter over Google+ is because of examples like this. You should not have to take more than 1 step to complete a task like embedding a card.
Google released a blog post about embedding a Google+ post on your website.
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Part 1 - An SEO's Guide to Tumblr
Part 3 - The value of Tumblr links revisited