To update the text displayed on the Login/Signup screen below the Facebook button,
- Navigate to Whitelabel >> Mobile Configuration.
- Under the Extended Settings, update the text configured under the Facebook Signup Text field.
- Save the changes made and this would display the changes on the App signup/login screen.
If you do not have access to the same, please create a ticket with support.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)