No you dont own the private keys the exchange could close down tomorrow or be hacked and you would lose all your coins. Better to use a wallett were you control the private keys like electrum or a hardware wallett like trezor.
Not enough information being available for beginners. I had good information 1 year ago to invest but i didnt have a clue how to set up a wallett or for that matter even what a wallett was. I knew it was going to do well but i didnt take the time to figure out how to even begin with setting up the wallett and secondly were to buy it. Thats whats stopping a lot of new people from investing as it seems all very complicated from an outside perspective.
Always write down your private key and store if in a safe place that you will not forget or noone will touch. If you did not do this then im afraid noone can help you.
I created an account on there on thursday before the ico started. Since then i havnt been able to deposit eth or btc into my wallett on there as they have blocked deposits. Will i be able to deposit and buy some tokens before the ico finishes? Or will i have to wait until it goes on the exchanges as by then i dont think it will be worthwhile.
Ive decided to invest in omisego i think it will see a big rise during the time of uncertainty during the btc fork people will put there money into alts.