Best way is to go to the page for the appropriate set (in this case, since you say it is Bronze, go to https://www.tcdb.com/Checklist.cfm/sid/146271/2017-Topps---Rediscover-Topps-Stamped-Buybacks-Bronze). At the bottom of the Left column is a link that says: See any inaccuracies? Click here to let us know. Clicking on that link will let you submit an inaccuracy report. Just report that you have a card that needs to be added to the checklist, and include as much info as possible (Card number, player, team, and, if you know it, what set the card orignally came from). One of the L8's will get around to adding it when they get a chance.
In this case, I would ask them to add Card #660, Lee Smith, St. Louis Cardinals, from the 1991 Topps set. If you want, you could also include that the card is an uncorrected error card (career IP should be 918.2) and that this is the light Topps logo variation.