1. Ask the team member to go to: https://app.blinkchat.com
After accessing, ask the user to create the account using the Facebook login

Login with Facebook
2. After the account is created, the following screen will be displayed:
IMPORTANT: You will not need to enter ANY PIN!

LOGIN Screen
3. Now, with the company OWNER login, go to: Settings > Team, and add the member's email used to create the account:

Go to Settings > Team

Add the user's email by clicking ADD MEMBER, and define the permissions the user will have.