From this page in the General options > Commissions & Payments you will be able to set up the following sections:
Commission options
Default commission rate: enter the default commission rate for all your store affiliates.
Prevent affiliates auto-commissions: enable to prevent affiliates from getting commissions from their own purchases.
Exclude taxes from commissions: enable to exclude taxes from referral commissions calculation. E.g. if a product costs €100 and there’s €20 tax added (for a total of €120), the affiliate commissions will be calculated on €100.
Exclude discounts from commissions: enable to exclude discounts from referral commissions calculation. E.g. if a product costs €100 and a €20 discount is applied, the affiliate commissions will be calculated on €80.
Payment gateways
In this section, you can enable the only payment method supported in the free version, the Direct bank/wire transfer.
For more details about how payments via direct bank/wire transfer work, please, visit this page.