You need certain rights to use the NemKonto self-service for businesses.
The request is sent to your rights administrator, who must grant you the right before you can gain access.
Once you have been granted the "Right to access NemKonto", you can use NemKonto's self-service.
In the self-service, you can log in with MitID Erhverv and view the company's NemKonto.
You do not have the ability to change the company's NemKonto.
If the company's NemKonto needs to be changed, you can read more here.