Look up the show at TheTVDB. If there are several versions of the same show title, they are usually distinguished by a suffix like “(US)” “(2013)” or something like that.
Then rename the top folder of your show after this title,
Then perform the Plex Dance
In some cases, you still have to use ‘Fix Match’ (only on the top level of the show, not on individual episodes or seasons!).
You can use the exact show title as search term or you can use the unique “Series ID” number of the show that’s used on TheTVDB website.
e.g. 74850 for this show: https://www.thetvdb.com/series/supernanny-us
In some rare cases, you’ll have to use ‘Split’ before ‘Fix Match’ (again, only on the top level of a show).
