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However, since you are a paying member, you can also use the "manage atachments" button at the bottom of the text window of a new post to upload pics directly from your PC.
Now that you have your Photobucket account, the rest is easy. Just insert the IMG code for the photo wherever you want it to appear in the thread. It will look something like...
Cool. I didn't know I could upload from my Mac desktop as a paying member. I discovered that the trick is to drag file up to this box after I've attached it.