The kiosk has a check box for people to get texts. How do I remove this?

The checkbox in kiosk mode appears when you have requests set to auto-approve as in that case there is no wait estimate set and less need for the text confirming a time. It is designed to make sure people want to get the confirmation text, similar to how a host might ask if they'd like a text when added to the list. If you change the setting to turn off auto-approval, there would be no checkbox and instead the confirmation message would go out if you accept the request. 

You can change your settings for auto approve on the website under Account > Settings > Add Yourself > Confirmation & Approval. Change text options on the website under Account > Settings > Notifications (there's a toggle option to switch between waitlist and ETA confirmation texts). 

In the app, go to the gear icon > Add Yourself > Confirmation & Approval to change auto-approve settings. For texts, go to the gear icon > Customization > Notifications. There's a toggle switch under the Confirmation text to switch between waitlist and ETA requests.