You would need to have a client side validation occur in order for the user to see the message about the password when they were entering it as apposed to when the page was submitted.
You can make use of Spry validations to add in this type of password validation though. Here is a link to the adobe docs for this specific type of spry validation:
help.html?content=WS1AE9FEA7-B082-4e83-B929-86A124320624.html