here's how you do it without uploading any picture.
1. Google any picture that you like. or if you have pictures aleady upload accross the internet just get their URL.
2. There is a square icon on top of the box where you are typing your post. when you move your mouse on it a tool tip will appear "Insert Image". click it and paste the URL wherever it is required.
3. Click Submit/Ok button
There is also option for uploading picture from your hard drive.
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