This example may help: https://ooktech.com/TiddlyWiki/SimpleTaskList
If you are talking about the example on tiddlywiki.com the answer is to make a tiddler with the tag task -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/7adda56d-208c-4b08-aa61-fa3e9af2ca45%40googlegroups.com.