Hi, you seem to have been using bbcode incorrectly (at least judging by post edit history, if there was something else please try showing what you did so I can check if it's broken on our end).
To add images to your post, use [img]image_url[/img] bbcode, and to have it behave like a clickable button, wrap the url code around it: [url="link_url"]clickable content[/url].