Then you'll get a listing of all the Maddoxes spelled between the names. If you don't find him there, click on the top pair, looking for your Thomas but listed without a middle initial. You'd get a similar listing like you'd see below which shows the many Notley Maddoxes. Many will have Birth and Death Dates but some won't. You may have to look at quite a few but you can skip those whose birth dates are way off.
Some names have no birth dates.
Many many were misspelled by county or census record takers. At the Bottom of the Person's view, below the Tree, see some other Controls. Play with the links on the real database, and you'll get the hang of it. Look for Maiden names of women who married Maddox men, or other Surnames of those who married Maddox women. Once you've found a possible relative , click downwards through children records or click upwards for parent records.