The "View Summaries" tab is only for generating reports, not for any editing. You need to instead get back to the main page for the tax year in question. Near the top of the Summaries page should be tabs such as "2019 Donations" "2018 Donations" etc. Click on the tab for the year you're working on, and it should bring up a page that includes radio buttons for editing individual groupings (Items, Money, Stock, Mileage). Click edit for the one you need to update, and you should be good-to-go.