To use it, when composing a message, click the Browse... button and double click the image you want, then click "Host it" to upload it. The Imageshack site will come up in a new window, and you can copy the text in the first box (entitled "Hotlink for forums (1)") and paste it into the message you are composing to have the image displayed.
It's easier than it sounds, trust me.
You can disable the ImageShack link if you wish (since it can take a moment to load) by clicking on Profile, then selecting the option to disable it under Preferences.
Enjoy!





