On the last screen of Post 1, the popup box has a "View Person Page" link. I clicked on the link, and the Footnote Page for Frederick W. Seaver, based on the 1930 US Census information, appeared (two screens):
I clicked on the "Search Footnote Pages" button and this dialog box opened:
I clicked on the button for "Is Same Person." That added each Footnote Page to the other Footnote Page in the "Related To" area.