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if the site will be unavailable for a long time due to the DDoS attacks that will be with Steam? how users can use the functionality of the system?

There are other sites that show content of block chain. Anyone can run their own full node.

Can you prove it?

https://steemd.com/ check this one out. That is one possible blockchain explorer. Steemit.com is another version of a blockchain explorer.

well, assume that no password is sent to the server. Really you can not delete the posts from the site as you wish?

There are other sites that show content of block chain. Anyone can run their own full node.

Whether there are other ways to create and change the password ?

Yes. You can mine an account and/or set any public key you like.

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