Okay......in case anyone else is having problems posting photos here, these are the steps I needed to take:
1. Uploaded my photos to flickr.com I assume other photo sites will work as well.
2. Left click on a photo you have uploaded to Flickr to enlarge it.
3. Right click on the photo
4. Highlight the photo's URL
5. Right click on the URL and click COPY
6. Open the message window in astronomy.com
7. Click on the little "tree" icon
8. Right click on the URL line and hit PASTE
9. Click on the INSERT button
Maybe there is an easier way, but that is what I have to do. True, it's not all that hard to do once you figure it out, BUT......it used to be much easier and faster.......just had to "attach" a photo to your post.....right out of your computer's "pictures" file. Not sure why they changed it to require you to upload your photos to another location first.