If you're using a desktop or laptop computer, click on the green Save Search bar at the top right side of the search results page. A popup form will appear. Enter a name for your search, select how often you want to receive alerts, and click on the Create Saved Search button. You'll see another popup confirming that your search has been saved. 

If you're using a phone, tap on the green Save Search bar at the top of the page. A popup form will appear. Enter a name for your search, select how often you want to receive alerts, and click on the Create Saved Search button. You'll see another popup confirming that your search has been saved.