Add Giving Assistant to "donate options" page
https://www.torproject.org/donate/donate-options.html.en
Add Giving Assistant as an option after "Donate via Amazon Smile" following the same format:
Donate via Giving Assistant
Giving Assistant helps you donate a percentage of your cash back earnings to us with every purchase you make at 3,000+ popular online retailers.
Use Giving Assistant to save money and support the Tor Project
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information