You can just use a free service, and I would recommend Postimage.org :
http://postimage.org/Instructions :
1. Click on the link
2. Browse your machine for the picture you want to upload (so you'll need to save it to your computer if you haven't done already)
3. Click on the "Upload" button
4. Click on the actual picture, once it appears after being uploaded
5. It'll then open in another tab
6. Right click it and "open image in a new tab" (if you do that on the previous screen, you'll only open a thumbnail)
7. Right click the URL (address bar) and copy the web address
8. Paste it into the "Img" tool (between the square brackets) in your message
I think I'll sticky this so we don't have to answer it every month like we seem to be doing at the moment
