Q. How do I use "Ibid." in Chicago Style.

From The Chicago Manual of Style, section 14.34:

You may use the Latin abbreviation "Ibid." when referring to a single work cited in the note immediately preceding.

For example:

5. Huisman and Warner, Locating Medical History: The Stories and Their Meanings, p. 65.
6. Ibid.
7. Ibid., p. 99.