Anyway, the reason why I need to set a password to a page I intend to create is because I want to write a letter only I can read without having to set the entire blog to private.
But on second thought, it's quite mafan (troublesome) to encode the javascript when blogging on the phone. So I decided to jz create a totally brand new blog for that purpose instead. And if things do not go as envisioned, I can jz delete the entire blog instead of deleting a set of pages one by one. Jz one single click and poof, the entire blog will be gone. Easier that way.