Once you signup for the first time in yoheim, you are asked to export the private key which is the most import element of yoheim. You should copy/save it somewhere very safe if you lose it you will lose access to all your resources that are associated with you in yoheim.
You may call it a master key of your account, So even when you know the password for your account, you will need this key to access your resources. The app asks you to import your private key whenever you log in to the app.
It’s highly recommended to backup your private key safely, or somewhere in any secure cloud storage.