To perform a simple Search in attributes, head over to the Map View of the map with the layer that you are looking to search within. Click on the hamburgeler (menu) icon next to that layer, and click View Attributes. Once the attribute table pops up, click the hamburgeler icon within the table, and choose the top option for Search. This will bring up a pop-up window which allows you to choose the fields you want to search within as well as to type in any key words or numbers for the search.