#1Go to youre flickr account. Right click a image.
#2 Click Properties,
#3Copy the URL.
See the liitle ICON in the posting window that looks like a mountain's and sun.
#4Click that and paste the URL in the address bar.
You will then have an image ready to show.
TAKE NOTE THAT ONLY IMAGES THAT ARE SET AS PUBLIC ON YOUR FLICKR WILL SHOW IN YOUR POST.
PhotoBucket: All you need from photobucket is to copy the IMG CODE and paste it in the post window.
But just like Flickr. The image need to be set to PUBLIC.
Now THIS IS VERY IMPORTENT. Both those Image hosts EAT COCK and can be UNSAFE! Use one of the ones you find on the list found this link.
Most of those listed use settings that are very much the same as the ones you would use on Flickr and Photobucket.