This feature can be accessed by going to UMP Dashboard -> Extensions -> Import Users&Levels.
Here you can download the CSV Sample File which you will use to import or update your users’ details. You must keep the columns found in the CSV and respect the structure. Only the fields found inside the sample file can be imported or updated, you can not add custom fields.
Once your CSV file is ready, come back to UMP Dashboard -> Extensions -> Import Users&Levels and click on the Choose File button and upload it.