Somebody could help me?

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I have some skill on PHP, but i'm not familiar with the way the code is structured. 

I added a new field in Orders table called "delivery_schedule". This field is a char(1) that assume the following values: 

'm' to morning 
'e' to evening 
'n' to night 

What changes are necessary in all files of the chekout process to make it work using 3 radio buttons in "checkout_shipping.php" ? 

Regards, 

Erico Oliveira