You can open the Caller Aliases Dialog by choosing the menu command Settings->Caller Aliases.
A caller alias is a name for a caller you receive messages from. Since the caller ID coming with the message file consist of digits (the phone number) this alias makes it easier for you to identify the caller.
The caller alias list shows the aliases you have already defined. You can select an item to make changes to it.
The Add button adds a blank entry to the list.
The Edit button opens the Edit-dialog for the currently selected item.
The Delete button removes the currently selected item from the list.
With the Close button you can close this dialog.