Hi Mike Sorel,
To do this requires a custom coded step. I created a sample test that does something similar to what you want using our ASP.NET demo site. The code finds the row with the right text, then finds the checkbox on that row and checks it. You'll have to tweak the code to find your button and click it instead. I'd have to see the structure of your HTML before I can give you code that will actually work in your specific case.
Also, Project Elements is the same thing as Elements Explorer.
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