clarification on my swimming fundraiser

It isn't obvious how to donate to a particular person's challenge. If you go to my page (https://secure2.convio.net/msaa/site/Donation2;jsessionid=0F8358E720F6BA27CCEAFFDB68735658.app274a?idb=1256320722&df_id=4520&FR_ID=1270&PROXY_ID=1636866&PROXY_TYPE=20&4520.donation=form1) and click on "Donate to MSAA" in the upper right, those donations go toward my challenge.