What is a lady anyways?
You mean a XIX century lady? All mousy and delicate and 'I shall never climb a tree or play boy games'-type of lady?
Or do you want to learn how to stand up straight (without slouching), walk gracefully and how to properly perk up your pinkie finger when you (noiselessly) sip your cup of Earl gray?
My advice, google up 'lady + manners'. See what you find. You don't need the '+' sign, btw. And yes, my motto is: When in doubt, google.
Stop looking. You'll find it someday.