To find a word or an expression in a text, you can use the search tool . If it is not displayed, you can make it appear by clicking on its icon in the tool bar. This tool will allow you to search a word or a regular expression and to replace it if you want to. It can be case sensitive and look for isolated words.
Note: The search tool will look for the wanted word in the editor or in the context tool, depending on which one has the focus.