Select the text to be edited, and use the typical keyboard shortcuts, such as  Ctrl-X and Ctrl-V. 
  
If desired, add comments to the expression by starting the line with the
# or // characters. 
 
 If desired, add and remove comment characters from a line by right-clicking
on the line and selecting Toggle # (or
//) comment. Alternatively, you can add and remove comment
characters from multiple lines by selecting the lines and entering Ctrl
+Shift+# (or Ctrl + /). 
 
Click clear to remove the contents of the Expression
text box.
  
Click OK to save your expression and to close
the Calculator Component Editor.
  
 
 
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