There's a free picture hosting site:PHOTOBUCKET.COM
Create an account there first, then upload the pictures there (to your album), then when you make a new post:
Click on the image on photobucket, and click on direct link (it will copy the link).
Then in your post, put your cursor on the the box under 'B' for bold, and it will say "Insert image" . Click on that, then paste the picture link.
Repeat for more images.
Best to have two windows with your internet browser open at the same time.
One for Photobucket, and one for this forum.
Good Luck.