What is my dsl router password

I'll tell you what your password is if you tell me what color my carpet is.

You probably don't know because you were not there when I picked it out, nor have you visited my house.

We won't know what your password is for the same reason, you picked the password, or at least you were involved with whoever setup the router for you, so YOU are the one that would know what it is. If you don't, you can look in the documentation for the default password to get in the router (which is usually admin and a blank password) or reset it to factory defaults and then use the default password.

If you are talking about the DSL setup password to connect to your service, contact your service provider.