login&password

Who are you asking?

Login and Password for what???

https://www.mql5.com/en/auth_forgotten

You are asking for Login and password for your new account right. 
Just sign up with valid email address and you will get mail for your new password. 

enjoy!

For which account?

Your mql5.com account? You've already logged in.

Your broker account? Ask them.

A demo broker account? Create a new one and write it down.