You can register on the Tarjouspalvelu.fi site at https://tarjouspalvelu.fi/.
You can register a company without a VAT number as follows:
1. Go to the Tarjouspalvelu.fi supplier portal, select your desired procuring entity and click the "Register" link at the top of the screen.
2. In the form that opens, select "The company does not yet have a VAT number" and press the button marked "Continue to registration".
3. Complete the mandatory information marked in red on the registration form and click "Register".
Note: you cannot complete the details in the "Contact person" and "Email address" fields. The system transfers the details automatically from the "User account details" column.
4. When you have received confirmation, open the activation link sent to your email address.
5. Your browser will open a page confirming that your account has been activated. You can log in to the service using the account you have created.