The moment a manager at your company adds you to Timezynk you get an invitation e-mail. Note that the sender in the email is Timezynk Support.
When you have received the invitation e-mail click on "Choose password". Then fill in your chosen password and click on "Save new password".
Now go to either Google Play or App store (you will find links to these in the invitation e-mail) and download Timezynks mobile app.
Then open the app, fill in your user name (you will find it in the invitation e-mail), password and click on "Login".
Could not login? That could depend on the following: