website to modify and add few form

i have a php script : [login to view URL] here it is you have to modify form i will start accept voucher code so i need form so the client can send me his ukash code,paysafecard code. i ll cashout manually so no payment gateway required this is a very simple project: modify exist currency to another,add 2 box in each payment form and disable redirection to payment gateway. project is quite simple so dont bid over the limit i fixed