For Chrome, use the Search for a Cause extension available here: https://chrome.google.com/webstore/detail/search-for-a-cause/eeiiknnphladbapfamiamfimnnnodife
For Firefox, use the Search for a Cause extension here: https://addons.mozilla.org/en-US/firefox/addon/search-for-a-cause/
For other browsers, you'll need to manually set Search for a Cause to be your default search engine. This should be done by going to the settings or preferences options for the browser and adding a custom search engine by adding this URL: http://search.gladly.io/?q=
you may need to add "%s" or another variable after the = in the above URL.
We hope to add more browsers to our extension support in the future.