Modify „Kasse“-Site

Hi there

i am using woocommerce. When I navigate in the settings through Design-Customizer-Woocommerce-Kasse I see the “Kasse”-Site. On that site there is a box called “Bestellhinweise (optional)” in which people can add individual notes to the order. in that Box there is a grey text written. That text I would like to modify, as well as the title of the Box “Bestellhinweise (optional)” and the title above all that „Zusätzliche Informationen“ Can you help me, how i can modify that parts?

cheers
Dani