Yeah, it gets to be laborious to post pictures, but you can streamline the process.
1. Keep your paint program open and minimized, then 'copy' the image using the right mouse click;
2. Paste into paint program, resize, rename, save to desktop;
3. Keep a tab open to your hosting account with the default location to find new files as the desktop;
4. Click the upload tab at your hosting site, and select the image, which should appear at the top of the column.
5. Rightclick to copy the link to the clipboard.
6. Paste into ATS message space.
Sometimes you can grab an image while you're proofreading in another tab, saving time.
Sorry it's not much help, but if anyone else has tips they can add them.