So I just clicked on the "disk" icon and saved the latest edits in WORD. But
I really did not mean to do that. Say wnated to do a "save as" with new name.
How do I undo the action?
As long as the document is still open, you can use Undo to bring the
document on the screen back to the condition before you started this
session, and save that as a different file (for example,
MyDocBeforeChanges.doc). Then use the My Computer program to rename
the modified file, and finally rename the BeforeChanges copy back to
the original name.
If you've already closed the document, Undo is no longer available. In
that case, let's hope you had the "Always make backup copy" option
turned on in Tools > Options > Save; if it was turned on, the
preceding version will be in a file named something like "Backup of
MyDoc.wbk" in the same folder as the original.
If neither of those methods is available, you're just unlucky. Make a
copy and try to identify and remove the changes from it.
For the future I strongly suggest you read
http://www.gmayor.com/automatically_backup.htm.