Welcome to planDisney, Kim!
Disney Genie+ unleashes phenomenal cosmic power, allowing you to reserve
Lightning Lane access for select attractions. If you did not purchase
tickets that include Disney Genie+, you'll be able to purchase it on a daily basis through the
My Disney Experience app. There is not really any advantage to purchasing Disney Genie+ prior to the date you plan to use it, other than the few moments of time it will take to complete your purchase. Since Guests may reserve their first Lightning Lane attraction beginning at 7:00 am, I recommend purchasing Disney Genie+ 5 or 10 minutes prior. This is what I did on my recent trip, and it literally took only seconds to complete my purchase. To purchase Disney Genie+ on the date you plan to use it, use the menu button in the lower right corner of the home screen on the My Disney Experience app to select "My Genie Day". Scroll down a bit to the purple banner where you see "Get Disney Genie+ for Today". Follow the steps to select your party and confirm your purchase, and you should be all set! Simply repeat for each day you would like to use Disney Genie+ service. I actually prefer purchasing this way rather than for my entire ticket, as I felt I did not need Disney Genie+ on all the days of my visit.
I hope that helps! Please stop by planDisney again with any additional questions you may have. Have a wonderful vacation!
Anne Marie