Use an image posting site such as Photobucket or Imgur, get a free account, then upload a picture to that site, and copy/paste the BBcode that the image gives after uploading in a message here.
Or, you could wait until you get the necessary post count and start a public album here. You create a public album here, and then link the code (after upload) into one of your messages.
If this is not clear, maybe someone else can help you out more, or a mod can point you in the right direction.
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