Since your not the only one, I'll give a quick tutorial:
1. go to the site, obviously you're already there.
2. When in firefox press (mac) cmd U or (Wndows) ctrl U.
IE: go to page > view source.
Safari: (mac) Alt cmd U. (windows) no clue, but who uses safari on windows?
Chrome: I have no experience with chrome, but I don't think it will be difficult to find
This will let you see the html code of the page.
3. now look for this: <link rel="image_src" href="http://farm6.static.flickr.com/5201/5352806801_5104a843f7_m.jpg">
firefox:
Safari:
Internet Explorer:
this is where the picture is saved.
4. take this out: http://farm6.static.flickr.com/5201/5352806801_5104a843f7_m.jpg The actual picture. You can take this url and post it, only this will be the result.
Ofcourse you want it bigger and there is a little trick who does it. Change the M on the end to a B.
for example:
this http://farm6.static.flickr.com/5201/5352806801_5104a843f7_m.jpg needs to become http://farm6.static.flickr.com/5201/5352806801_5104a843f7_b.jpg
5. now post the link with the B at the end, and we're finished!