To edit a prompt, you can follow these steps:
• Tap on the metric that has the prompt you want to change, to access the Metric Details screen
• Once on the details screen, tap the button in the top right corner with the three dots '...' to reveal a dropdown menu
• Tap 'Edit Metric' to reveal a metric modification page, where you'll find your active prompts for your metric at the bottom of the list
• Tap on the Prompt category to reveal your metric's prompt(s)
• Here you can update the prompt message by editing the text field, and change the prompt time by tapping on the time displayed in the top left corner of the card
• Once these changes look good, press the square floating action button on the bottom right of your screen to save changes
To access the edit metric page, you can follow along
here.