you can hotlink to any photo from the web using the [img] tags, but i prefer to upload my own copy to photobucket first. i used to hotlink other images from across the web, and some have been taken down. if you're interested in alternative image sharing services, imageshack.us is another popular option. as far as i know, the procedure for attaching images directly to posts using bullshido's tools is a bit tricky, and may have been removed during the last upgrade anyhow. does that help?
If I may ask, what's the preferred method of adding images to articles? Do I have to upload them to photobucket and work from there, or is there an easier way?