How to convert from Unojoy joystick Back to regular Arduino

i converted my arduino uno to unojoy for a steering wheel joy stick about 2 years ago and i forgot how i did that .now i want to convert it back to a regular arduino . searched the internet tried my things but no luck . can someone guide me a step by step process with links etc to convert it back to a regular arduino ? ill be really thankfull

Here is a tutorial about the process: https://www.arduino.cc/en/Hacking/DFUProgramming8U2 You can skip the part with soldering on a resistor. That is no longer necessary.