In Flickr, once you've established which size photo you want to post, since there's 4 size options, you Right Click on the image, and choose Copy Image Location. Then, back in your post, you pick the Insert Image Icon and paste the Image Location into that window. Alternatively, instead of using the Image Icon, you can type in your own IMG Tags, like this (You will need to remove the asterisks) [*IMG]Image Location[*/IMG]