With Poser 4: (0) If it is a character, select its BODY. Even if the part indicater shows BODY already, press the 2 key a time or two, to make sure that Poser is looking at the current figure's BODY and not someone else's BODY. (1) Select top menu Object -> Properties. (2) In the resulting dialog box, change the name. Attempt to rename the BODY is diverted into renaming the figure. (3) If it is a prop or hair, omit step (0).