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To do that you should enter the payment tool wizard.
You can do that by clicking on the payment tool and then on the wand icon at the top right corner:
Once you go into Wizard, you will need to connect to your Stripe and you will be able to go to the next screen, where you will see the following box:
You can change the "Donation" text to something else if you wish, but if you want to remove it and not have any text under the box, you can just add space and click on Next.
Do let us know if you have any issues doing the same or if you have any questions and we would be happy to assist with the same.