rails c in development
heroku run rails console in production

If user exists

var = User.first OR var = User.find(id number)
var.password = "password"
var.password_confirmation = "password"
var.confirmed_at = Time.now

var.save

If user doesn't exists

kenny = User.new(email: "someemail@blah.com", password: "blah", passord_confirmation: "blah")