Update - whoops, PhilC beat me to it.

( O . O )

Oh.  Well, first up, not all male figures can transform into female without first receiving some sort of injected morph in some way.  If you have Poser, there already are male and female figures ready for your use.  Look inside the Character tab of the Poser library menu (right hand side pull-out drawer of the Poser interface).

Someone will soon come along and provide you links to tutorials - but I'll provide a hint - seek out Dr Geep's Poser tutorials.

And, when you unzip poser ZIP files, you have to retain the folder structure, else your resulting fils won't be happily found by Poser.  OR, if it's a DAZ3D EXE installation, then make sure you specify and remember where you tell it to install.  Inside of Poser, make sure you add these runtimes to the runtime library, if they are not already inside your main Poser runtime ( see Dr Geep's tutorial on using the runtime library).

Eternal Hobbyist