Once a Standard ECN Account is created, an email is sent to your inbox including your login information for this account. This email will contain an Investor Password.
It should be noted that this password is Read Only, meaning that it is used with the purpose to monitor trades by any Mentors if applicable.
When creating a PAMM Investor Account, a new email is sent out with another set of login credentials so that you are able to join a fund. This would be the login information that needs to be used in order to be able to invest in a fund.