A bit more complicated, but if you'd like to post the full size version:
(1) Go to the video on Vimeo
(2) Hover over the top right of the video and you'll see an icon that looks like a paper plane ..... click on it.
(3) Click on the box under 'Embed' to highlight it, then right click and copy.
(4) Paste the code in your post, then select all the pasted code and click on the '#' button above the smilies.
(5) Replace the word or four letters 'code' in the two sets of brackets with 'html'
(6) Preview before posting to check all is well
from on Vimeo.