It's not complicated and it's not about fear of giving out email addresses. It just about the way things are done here.
While the link I posted shows how to get the picture in Windows 7, Allan's shows how to upload it to an image host and post it on the forum. Or you could even just attach the picture to your next reply:
1. Click "Additional Options..."
2. Click "Browse..." and select the picture.
3. Click "Post"