want to know Why are you redirected to the 'Welcome to MyDMV' page?
do not
What should I enter when I need to log in?
You can use the tool to reset it. You will need to enter your username and the security questions / answers Shared secrets you chose when you created your account.
and can i use the tool?
of course You can use the tool to reset it.
and how can I do if I don't remember the password?
you can use the Forgot your password tool on the same page.
If the user you use tells me that it is not associated, how can I do it?