Sounds like you're trying to sign up rather than login.

Much of what you're telling me sounds more like confusion based user error. And people are trying to help you.

Keychain is quite straightforward to setup. If you haven't changed your keys, they'd still be your steem keys. It's needs to be setup before it works. Nobody can do that for you. Documents are available. Take your time with it. Only need to set it up once.

Logging into Peakd is just a matter of selecting the login option at the top right and entering your name in under the keychain field.

Start browser, sign in to keychain, login to Hive site of your choosing (always selecting the keychain option), enjoy Hive experience. That's the "modern" way, or at least one of them. Keychain will give you popups when you push buttons on sites that require keys, and those can be set to be removed with a push of a button. Quite seamless after that.