Why can't i log into my computer?

[ChannonHooks]

So, I downloaded an app called Steam, which is very trusted. Then, I happen to turn off my computer and when I come back to log in, there is no password box and the email that is usually above the password box is my old email. Every-time I click the sign in box, and I sign in, it brings me to a page saying "create a pin" and when I click on it, it says retry, and If i click skip this step, it brings me back to the beginning. Please help!

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