You will only need a simple program named "CheatEngine" With that program, you will change the amount of money you got on your career. Just choose the "speed.exe", enter you value of money. Do a first scan. If you get too many results, you must go into the game again, change the amount of money, type it in CheatEngine and do a second scan. This should give you the adress that you can change the value for.
Remember to have the game open while you do it.
If you don't know how to minimize the game while its open, it simply press the "Start button" (it has the Windows Icon) or press CTRL+ALT+DELTE.