I use IE and am giving this info only from my experience with other forums.
Most do not allow you to change the subject line for some reason.
Go to your User CP, then click edit options. Look at the bottom option and switch it to enhanced interface, to get full use of the new software.
If you click the Go Advanced button on the bottom of a topic (quick reply), and then click the paper clip icon you can upload pics from your computer. If that doesn't work get a photobucket account and click the envelope icon on the board here to add the link to your pics at photobucket.
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Good luck, I hope this helps.