Welcome to TBN - Glad you are here.
To post a picture - go to the bottom of any TBN page where you wrote your post. Write a post, then click on the icon line at the top of post area on the picture icon, just to the right of the Smiley Face (round one). That will bring up a window. Click on the center of that window and it will take you to your computer to select a picture. The picture will become part of your post. That is about all you will need to do - to insert the picture.
You might want to find the image that you want pan put a copy it and place it on the desktop so that it will be easy to find.
Best wishes.