To create a payment:
Go to Payments from the menu.
Click Add new.
Select the trading partner, method and put the amount. Then, click Submit.
After a payment is created, you'll be able to finalize it by adding invoices. To do that, on the Invoices section of the page, click add, then select the invoices you want to add.
You can also add deductions if applicable. Just click add on the Deductions section of the page and put the amount of deductions.