How to use
- Install plugin - Go to Extensions->Plugin Manager and search for 'plg_userimport'
- Click on plg_userimport plugin, set the Access and Enable it
- Go on your-site/index.php?option=com_jsn&view=import
To store fields that contains multiple values (Checkboxes and Selectlist with multiple options enabled) you need to use JSON format, so for example with values like Music, Art and Design you need to use this value: