If you have made a deposit and didn't verify your account, or if your account has not been fully approved, the trading will be blocked due to regulatory rules. You will be required to verify your account in order for the trading to be enabled.
For more information on account verification you can also read this article:
What documents do I need to provide in order to open an account?
If your account is verified, please check if the instrument which you are trying to trade is within its trading hours.
What are the trading hours?
Contact our Customer Support if the above does not match your case.