I have been looking into putting animations (GIF's) into a Blog. Finally decided to look into it and the simplest way seems to be -
Find the animation you want by going to the appropriate blog or website.
Open another browser.
Sign into your Blog and open a document that you are creating (that is a new posting).
Click where ever you would like the animation to go in this posting.
Click on the animation and simply drag the image to your blog post that is also open on the screen.
You must re-size the two browsers so that both can be open on your screen at the same time. This can require a bit of playing about with.
Seems to work OK.
I've always liked this cancer one.