Welcome to Trip Advisor! :-)
I assume you are referring to the list of cities for the "Places I've been" map. If so - you can request a city to be added to that with this link in the Help Center: tripadvisor.com/help/how_to_add_missing_loca… go to that page (it has some helpful information on it) and then click "email us" in the third line.
That opens up a web form that when submitted, goes directly to TA editors. They usually will reply to you when it is added, via email.
However - if you are referring to a different list in TA - please reply with which list and someone here can tell you how to get it added.
Best of luck,
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