You will need to:
Log in to your account using the email address you signed up with.
Go to "Deposit Funds"
Choose Bitcoin or Debit/Credit Card (Currency available depending on Third-Party Provider)
Select that wallet you want to fund
Enter the amount to deposit
Select "Redirect me to the Payment Page" and follow the instructions on the screen
You will then need to do an Internal Transfer from your wallet to your MetaTrader account.
Tap here to see how to do an Internal Transfer.
Want to know more about funding? Tap here