Add a filter pane object to the sheet and then add the dimensions you want to use for filtering to the filter pane.
You can also use the global search to search for and select values in dimensions. See this document for more information: Qlik Sense - Global Smart Search (video)
BTW. You posted in the Qlikview section, but your question is about Qlik Sense. There's a section of this site dedicated to Qlik Sense. The New to Qlik Sense space is probably the best place for this discussion.