We have changed the contact person and the user making the orders. What should we do?
Any user with Administrator-level permissions can manage the contract.
Do not forget to change permissions to the Administrator user who is no longer in charge, or disable that user if she has left the company. This can be done in the Administration > Users section of the application.
If the person to change was the only Administrator and this user can no longer enter, you must contact Support to assign an Administrator permission to another user of the contract.