Employees do not register a business. You create an account like anyone else, then join an existing business with an invitation code the owner gives you.
Create your account
Tap Create account on the sign-in screen and fill in your name, surname, phone, email, password and profile photo, exactly as an owner would.
Choose Employee
On the role screen that follows, choose to complete as an employee rather than as an owner.
Enter the invitation code
A join-a-business window opens with a field for the code. The paste button fills it straight from your clipboard if the owner sent it to you in a message.
The button to join stays disabled while the field is empty.
Join
Tap to join. A valid code attaches your account to that business.
Close and sign in
Closing the success message takes you to the sign-in screen. Sign in with the email and password you just created to enter the app.
This is expected — joining does not drop you straight into the app.