You will need to manually create a Trading Account under your “My Accounts” tab to receive your Metatrader login details via email (See below to create a Metatrader account).
Instructions for doing that are provided when you create an account. The email will contain your details.
To create a Trading Account, follow these steps:
Click “My Accounts”.
You will be brought to the next screen to choose “Account Type" and “Leverage”.
Click "Create Account".
Now click “My Accounts” and your new account is there.