Open account with photobucket.com (free of charge)
upload pictures there, then you get links to those pictures underneath each picture.
choose link called DIRECT LINK
now on the forum, when writing message you have menu, in that menu next to RED LETTER A there is a picture icon, once you click that these comes up [img.] direct link [/.img], now copy direct link from your photo bucket instead of "direct link"
if need help, ask again.