Just go to the search page, use the search bar on the top. Once the desired company show's up click on the randomize button to pick up a new code. Tip: if you click on the code itself it will copy it on your clipboard. Then you to your desired website, use the code and enjoy.
Don't know either.
Don't know either.
The process of adding a code is very simple but in order to so, you need to be connected to your account. If you don't already have an account you can register by clicking here.
Once you are logged in, simply enter the submission page. You will be prompted to enter information about the code.
Click on the submit button. If everything is working correctly a popup will show up, if not very the given information.