Password problem after creating a new user

I created a new user account and when I try to login to that account by switching accounts it said wrong password. I searched here and found my answer here - Create a new user in 12.04?

Now when I clicked enable this account and I don't know what happened from then.. now I'm with a problem that ubuntu don't recognising my password. It's saying there's no password set but when I'm clicking it it's asking for old password.