To enable Terms and condition one must enable the Accept Terms and conditions flag by scrolling down to "Platform > Whitelabel > iFrame Configuration > Basic Configuration".
But to make this Terms and condition filed mandatory for the iFrame signup the flag "Enable Terms and Conditions as a mandatory field?" must be flagged. Below is the screenshot of the flag which must be flagged in order to make this a mandatory field:
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)