Your API login credentials are composed of a username and a password. The username is the same username that you use to log into your TribeHR website. The password can be either the password used to log into your website or your API Key, which is obtained separately from your password.
Your API Key can be found in your Employee Profile. Go to your profile, click on Edit Profile.
In the Account Details tab, scroll down to the bottom of the page and you will see your API Key under Add-ons and Services section.