Hello Sungsam I will add my small contribution to what has already been answered: - Most ways of using "label" work the same in Jmol as in Rasmol. However, "label residue true" has not been implemented. You must specify an atom within each residue. In general, you can get a reasonable result by choosing the alpha carbon or the beta carbon: select (selected and *.CA); label %n%r select (selected and *.CB); label %n%r