To post pics you click on "Go advanced" not "post reply". This brings up a new window where you will find "manage attachments", when you click that a little window pops up with your files. You pic the photo you want and double click it and then "download file".
To re-size you can use free programs like "picture editor" or even try emailing them to yourself in " email size" and transfer them to your desktop or where ever you can find them easily. Kodak "easy share" also works well or even "photo bucket".