You can see the submenu at OPC Client Main such as <Figure 1>, by selecting the Server menu from menu bar.
<Figure 1> Server menu at OPC Client Main screen
Add Server : Add a server to communicate. (Bottom of list)
Insert Server : Insert a server to communicate. (Upper what you select)
Delete Server : Delete a server which you select.
Modify Server Properties : It is menu to modify a server/access name which you select.
Add Group : Add a new OPC group at server which you select.
Connect/Disconnect : Try to Connect/Disconnect a server which you select.
Exit : Exit an OPC Client Main Program.
Relate items)
Modifying an OPC Server Properties