Start off by finding a picture you like on the internet. Could be from google images, or anywere.
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Right Click the image and say "Save Image As" (Firefox) or "Save Picture As" (Internet Explorer). Save it to your hard drive somewhere.
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Now go to
http://www.photobucket.com. If not a member click "join", then login to your account when you have joined up.
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Click on "Choose Files" to tell Photobucket you want to upload a picture.
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Find the image on your hard drive, then click "open".
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The picture will upload, and you can add a Title and Description. Then click "Save and Continue".
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At the bottom of the screen is a field called "IMG Code". This is the code you want to put in a message in our forum. Highlight the code and press "CTRL-C" to copy it to the clipboard.
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Now go to our forums, and in a new message or a reply to an existing message, just press "CTRL-V" to paste that code from Photobucket in.
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Here is a bigger version of the code in a message on our forum, so you can see the format.
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Submit your message, and there is your picture.
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Hope this helps.
Eagle