Not sure what your having problems with. What type of system are you operating?
If you go to new post or reply, you will see a list of icons above the text box. Click on the icon that has a picture with a yellow border around it, and you will get
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. From there you put your image location in between the ] [. Most people use photobucket or something like that as a host, or you can download the app for this site and upload straight from your phone.