At Buengo you can donate money directly to a Campaign, but not an organisation. That's to ensure that you always know where the money donated is going to, and how it's going to be used.
To donate money to a cause, look for a Campaign of your choice and tap on the Campaign listing to access its details and description.
From there, tap on the "Donate" button at the bottom of the screen. You will be taken to the checkout screen where you'll be able to enter the amount you want to donate and choose whether you want it to be an anonymous donation. Tap on "Continue", enter your payment details and tap on "Donate safely" to confirm the donation.
You can save your card details to make it even quicker next time you donate.
After you donated to the cause, you'll be able to leave a message to the organisers to show some support.