Make sure you already have an eBay account.
Make sure you have something that you are willing to sell.
Search for and select CGS.
Adjust the Pick donation amount bar to the level that you want to give to CGS.
Click the List your item button.
Login to eBay and start the Sell Your Item flow.
On the Create your listing page, in the Choose a format and price section, you'll see the eBay for Charity section; there you can adjust the Donation percentage that you set above.
Complete the Sell Your Item flow and wait for the buyers!
Once a month, eBay will transfer the full donation to CGS, without taking any fees from you or from CGS. And the CGS Financial Secretary will count the full sale amount toward your 2016 giving total.