You do not need to verify your personal data to create an account and view the exchange.
However, trading at CoinDeal is only possible when you go through the ID verification process (known as level 2). This will allow you to deposit Cryptocurrencies, withdraw Cryptocurrencies and trade on the exchange. There is a limit of 15 000 EUR (or equivalent in crypto) for the level 2 though. Once you go through the address verification process and become fully verified (level 3), then you can deposit and withdraw FIAT currencies freely.