Download the "Kronos Workforce Ready" mobile application. There are multiple Kronos apps, make sure you get Kronos Workforce Ready.
After installing the app on your phone, during your initial login you will be prompted for the following information...
Region is: North America
Company Shortname is: 6145398
UserID is: your Kronos User ID (the same on that you use here: https://secure4.saashr.com/ta/6145398.login) for most people it is the same as your e-mail handle
Password: you and you only should know that, but if you need it reset please submit a help ticket.