You need to be on the Appointible Pro plan. With the Basic and Growth plans, please contact Appointible support to update your account client reminder text.
1. Navigate to your Appointible account
Click the 'Apps' button in the left side panel.
2. In Apps
Click the 'Configure' button in the Clients Reminders panel.
3. Click on 'New rule'
4. Writing the text message
Make sure the automation rule switch is ON.
Write your text.
Click the 'Personalize' dropdown to include a placeholder field in the text message.
Finish by clicking 'Save'.
You can see the preview on the right side.