If this is for a Gathering, check the “I would like to designate” box, and pick it from the list.
We’re having technical difficulties. If the Donate button doesn’t work, you can go directly to our PayPal page, here. In that case, please email firstname.lastname@example.org to tell us how much you gave and for what. (It’s also helpful to report your Windows and browser version, so we can track this down!)