When an ECN account is created, an email will be received containing your account ID, trader, and an investor password. The trader password should always be used for trading on MetaTrader. On the other hand, the investor password is a read-only password that can be shared with third parties for viewing purposes.
When creating a PAMM fund or investor account, the same logic will apply.
If you are accessing a fund account on MetaTrader, use the credentials as advised above.
If you are accessing an investor account (using the credentials to join a fund), you will still need to use the trader password and NOT the investor password.