Answer:
When the picture you want is on the graph screen, press 2ND and then DRAW (above PRGM). Scroll over to STO at the top. Then select the first option, StorePic. (Use the second option to see a stored picture. Follow the same instructions, but you do not have to have the picture on the graph screen.) Press ENTER and then type the picture number you want to store the picture to; any number for 0 to 9. (The calculator can store ten pictures.) Then press ENTER. The picture will be stored.