Are you a Kroger shopper?
Go to www.Kroger.com.  If you haven't set up an account yet, you'll need to do that. They'll need your usual info, email, name, address, etc.  Chances are you already gave them all this when you signed up for the card, but you need to tie together the card info with an online account.

Once you're logged in, go to My Account, Select Community Rewards, then Edit.  If you happen to know the organization's code,  put that in the Search box.  If not, type in the name of the group you want to help in the Search box and click Search.  You'll get the closest results.  If the group you're looking for pops up in the results, select them, then Save and they're now set up!