Let's face it. None of us, especially the girls, are as pretty, flirty, or a popular as Glinda is. So, she's decided to help you by answering letters. All you do is ask a question in a PM or review. If you have a character in your story that wants to ask her a question, they may as well. Good luck!
*I know the rules are like that of ElphieOnEarth's "Ozian Post Office." I have received permission from her to publish this document.