The same question was asked not so long ago, so I've copied and pasted what I put there...
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If you are not a Premium Member, but are wanting to upload pics to the site, then you will have to do the following...
Register on
http://www.photobucket.com/ which will take a few minutes.
Once you have registered, sign in and click the
Browse... button. Search for the image that you are wanting to upload. Once located, double click the file and then click the
Submit button. Photobucket will now take your image and upload it to their server(s).
Once the image has been uploaded, it will place it towards the bottom of the page and beneath the image it will give you three links. Click in the box that has
Img next to it, then copy the link.
Once the link has been copied, create a new thread (or reply to an existing), paste the link into the message box. Preview the post to make sure the image has loaded correctly, then VOILA!