coupon program -- not functioning correctly

[inquisitive]

http://pastie.org/private/aw5ekgobnk4lbc1qtj9pw

 

Here is the source...let me describe to you want I want to do

 

- Make sure they enter the right promo code and reference number

- If they don't then return an error message per incorrect entry. I.E. (reference number or promo code)

- if all information checks out grab the referrer's number of referrals and add 1 to it. Then instead of showing them errors show them a header tag that says "Here is your coupon!"

 

Any help and/or direction would be helpful. I have googled for 2hrs and this is where I am at now...