You can find a search bar in the header with a Go button next to it. Should you need to search for any term, word or phrase, you can do so here by simply entering what you need to search for into the search box and then click the go button. If there is content relating to the term or phrase you have search e.g.: (project description, task title, etc,.), it will then be listed after the search is completed.
There is also a section where you can refine your search and add more detail to your search criteria. This can be found in user settings.