Sort:  

if we press the link and we can't log in again to us because we have changed all the passwords we have to know how to get our account back

You then have to go through the account recovery process.

More info can be found under @hive.recovery's blog

I have followed the instructions, how do I stop it?

Did you enter your credentials into the fake Hivesigner website?
If yes, you should change your Hive password immediately!

How do you change it, for example, if the password has been changed, everything?

You then have to go through the account recovery process.

More info can be found under @hive.recovery's blog