This page shows which (if any) iSCSI volumes you are connected to. Pressing the “+” (plus) icon allows additional iSCSI connections to be made.
This functionality is for connecting to volumes that another machine is exporting via iSCSI, not for exporting your own volumes. To export your own iSCSI volume/s, please use the iSCSI Target service.
Here, you can add targets to connect to. You will need:
Name (for your reference, not interpreted during connection/usage)
Target Address (IP or hostname/FQDN of the machine hosting the target)