However, there are certain times when the URL information is not provided in the export file from PubMed. When this happens, you can use the Reference Update feature to populate the field. To do this, highlight the record(s) in your library and then click the References menu > Find Reference Update.
An alternative way to obtain the URL is to search PubMed directly within EndNote. If you have never used the Online Search option in EndNote, the following video provides an overview of the process: