Read the citation example, and then use the drop-down menus to identify each part.

“Astronaut Bio: Neil Armstrong (08/2012).” Johnson Space Center. N.p., n.d. Web. http://www.jsc.nasa.gov/Bios/htmlbios/armstrong-na.html

“Astronaut Bio: Neil Armstrong (08/2012)” is the
✔ title
.

Johnson Space Center is the
✔ website
.

N.p. indicates the
✔ publisher
.

Web refers to the
✔ medium
.