Add fields to check out.

Hi I have an opencart site. I added 4 new fields to shipping method section on checkout. I also added 4 new columns to order table. But I could not post that fields values to db. I need a vqmod code to post that data.. my input type=text field names and ids are shiper_name, shiper_address_1, shiper_address_2, shiper_phone. and my column names are shipper_name, shipper_adres1, shipper_adres2, shipper_phone.