add forms and new fields on program build in Delphi without source code - repost

i have a program which is restaurant point of sale program , I want to add modifies on this program : note that I do not have the source code you will need to use resource program or Delphi decompile or debugger ……………… i want to add new fields on it to store new data on database for example : program contain fields for item name , item price ,when you add new order the order contain item count ,item price , and the total which is count*price per item. And the report show the sales for every item. i want to add new text box to store new data and I want add new fields on database to store this data for example : program contain fields for item name , item price , i want to add item Wight :" the main modify is I want to use the program in Fuel center (so the items will be fuel and the order contain the amount of letters instead of item count and price still price and I want to add text filed this text file to store the counter of fuel pump and another text filed get the last counter of this fuel pump ( the last counter on last closed order) to download the program: [login to view URL] Just note "the database of the program is fire-bird it located in documents" and it can modify easy  the excel file in attachment explain what i need thanks