You enter wordcounts of particular translation job in Words column:
Total wordcount is displayed in a panel below individual wordcounts (XTranslated, Repetitions, 100%, 95%-99%, 85-94%, 75%-84%, 50%-74%).
Alternatively, if you have Trados® Translator’s Workbench analysis log file you can use Load command of Log menu to load this log automatically:
Trados® Translator’s Workbench generates .csv (comma separated values file format) log files in the same folder as .log (plain text file format) files. CATCount processes .csv format only, to assure maximum (100%) precision in importing results of log files.