Hive Keychain is a google chrome extension, so you would add it on google chrome, then go to settings, and add accounts, add keys, and then when you log in the keychain will pop up, kind of like how the metmask connects for using different sites. That's jsut how I do it, i prefer the hive keychain becasue once it's installed it makes managing a bunch of hive accounts really simple.
@themarkymark/how-to-install-hive-keychain