Grannywin, I think some people are using Photobucket or similar. What I did was to create an album in my Gallery called Challenges, and copy the middle link from there. (If you haven't found that, you need to go to the extreme right of the thumbnail link and you will see a picture icon, click that and you will find the Linked Image URL to copy into your post).
If someone has the time, please let me know how you are posting the larger pictures. I am having a difficult time learning how to attach things in this new format.