You already have an account, but you would like to convert your account to a self-employed (ZZP) account.
No problem, you can combine business and private use via the Start/Plus/Pro subscription.
For your business administration you can add the company name via the app.
Go to Account -> Profile -> Contact details in the MyWheels app.
Add your company name.
The company name appears on every invoice and this way you have a small business/self-employed account.