Change the Display mode of the Protein: To change the rendering of the protein to Ball-and-Stick try the following:
Select ¬ Protein ¬ All
Style ¬ Scheme ¬ Ball and stick
Change the Display mode of the RNA: To change the rendering of the RNA to cartoon try the following:
Select ¬ Nucleic ¬ All
Style ¬ Scheme ¬ Cartoon
Remove the RNA from the Display by first selecting the protein and then displaying selected:
Select ¬ Protein ¬ All
Select ¬ Display selected only
Add the RNA back to the Display:
Select ¬ Display selected only [toggle off]