How to post via link from flickr?
Here's how I've done it:
1. Click the "Insert/Edit image from web" button (third from the right).
2. Browse to photo on Flickr, then right-click and select the appropriate size photo you wish to post.
3. Right click the displayed image and in Firefox, click "copy image location". For Internet Explorer, right click the image and select "Properties" then copy the URL for the image.
4. Paste this URL into the "Web Image URL" box. Done!