In EBSCO databases like America: History and Life or Historical Abstracts, first run your search and set any filters you want to apply. Then use the Share pull-down menu on the right side of the screen under the search boxes and select email alert or RSS feed.
New scholarship alerts in Library Search
In the Library Search tool, first run your search and set any filters you want applied. Next, make sure you are signed in.
Once you are signed in the option to "Save search" will appear at the top of the results list. When you click that, a bar will appear at the top of the page with the options to Turn on notifications.