Note that there's an API Quota of 2000 writes / day on this project. If you get a Quota error, try again the next day.
To create and link these filters, you will need EDIT access in the Google Analytics accounts you want to modify. This tool will only allow you to access privileged accounts.
Get started by clicking the big, blue button below. You will be asked to authorize this tool to access your Google Analytics data. After doing so, you will be presented with options for filter creation.