I use Imgur for posting images. But just to try it out I just used Brickboard to see if that works.
First, you have to open your login name in another tab. Then click [UPLOAD AN IMAGE] in your profile. Fill in the CAR NAME/Subject field, then click the Browse button to select the image on your computer, then click Submit My Image, then View Uploaded Image. That will show you the image and the HTML code beside it. Copy the HTML code and paste it into your message like this.

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1992 745, >500k km (now gone, but not forgotten)
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