You can do this on the search page. If you go https://www.sqlservercentral.com/Forums/Search, make sure your on advanced search, and type your username in the username field. Then on the Search Discussions box, click the down arrow, and select the forums you want (you'll need to expand the categories, I noticed that searching in SQL Server 2016 gave no result for myself, but searching in SQL Server 2016 - Development and T-SQL gave plenty).

Little long winded, but it gets you there.