If you have an account:
Go to the "Supply chain" tab.
Go to the "Invitations" tab. Here you can see all the invitations. The invitations are divided into being upstream or downstream.
In the overview you are able to see the company, approve or remove the invitation.
When approving you will have to read the policies (if there is any) and can accept it or not.
When accepted the company that invited you are now visible under the "Supply Chain" tab and then the "My customers" tab.
If you dont have an account:
Find the autogenerated email with your new login information (also check the spam folder).
Go to app and login with the login information from the email.
Now find the verify the email with the mail you received (if you cant find it check spam or generated a new email with in the app).
When login you can now see the organizations you have access to.
Chose the organization you want to continue with.
You will now have to add address information and accept or reject the policies from the retailer (if there is any).
When accepted the company that invited you are now visible under the "Supply Chain" tab and then the "My customers" tab.