Go here: [link] There's also the Help Desk, accessible here: [link]
But if you're just looking for regular help, go to the top one. If you're looking for something like reporting a Deviant or your order never arrived, go to the bottom one.
This thread already lists many places you can go to get help with dA, like the FAQ, the help desk, the #help chatroom... I'm not sure more is needed ^^