You have received an invitation via your e-mail address. (This may be in the spam folder). You must follow the link in this invitation to create a first password. Check here the requirements for a strong password for Celery.
This invitation is valid once and for a maximum of 24 hours.
Have you been notified that the link is no longer valid? Then ask your employer to send you a new link. Celery cannot help you with this.
When you go to the login page via your E-mail, you will get a login screen. Save this page if necessary, because this is where you have to be every time you want to log in. On this page you can login with your e-mail address and the password you created.
Existing user but (also) a new employer
You have received an invitation via your e-mail address. (This may be in the spam folder). You have to follow the link in this invitation to create an extra account.
Existing user but do not see new employer
Within Celery it is possible to switch between multiple employers and/or accounts with the same email address.
Existing user and can't remember password
You may not remember your password. You can then choose to:
1. create a new password or
2. to login without a password.