The easiest way to retrieve your password is to locate the email you received, containing your login credentials, when you first opened the account. If you are unable to find that email then you can easily reset your password.
This is done by logging into your Backoffice profile area: https://my.myfxchoice.com. Click on the Account tab and choose the account you would like to log into. On the right-hand side you will see a link labeled "Change password". This will allow you to change your MetaTrader password.
You can watch a step-by-step video on how to reset your password here: https://youtu.be/5Vb8oJ5DOH8