Hello, genius! If AG(1) is present in this list, I must select check box (2). In this web page, the keyboard arrow key does not work to pick the item below. I only can click on the item below. Please assist me in completing it.

Hello, genius! If AG(1) is present in this list, I must select check box (2). In this web page, the keyboard arrow key does not work to pick the item below. I only can click on the item below. Please assist me in completing it.