The user creating a company account will also be the administrator of the account.
You can create a company account here: https://app.zoa-gdpr.com/en/registration/company/
You will receive an email with an activation link in order to activate your account.
If you have a partner code from your law firm or data protection consultancy, you can add it with the registration form. This will connect your company account with the partner account. The partner will have access to your account.