Hey Tom,
I'm glad to see that you are utilizing our Golf Handicap Tracker on Yahoo!, and I am happy to answer your question about entering your wife's scores into the system.
Tom, it is only possible to track one handicap per Yahoo! ID. If you want to track your wife's handicap in the system, you'll need to set up another Yahoo! ID to do so.
I hope that answers your question. Please feel free to reply to this post if you have any other questions.