Hi there, Andy! Thanks for taking the time to visit planDisney with your question. As Sheriff Woody says, I'm here to help you "Reach For The Sky" on your upcoming Walt Disney World trip!
Since you already have the complimentary tickets linked to your account, you're off to a good start! You can start buying
Genie+ on the day of your visit anytime after 12:00 AM. But don't worry about staying up past midnight (unless you're Cinderella)! Attraction selections can be made beginning at 7:00 AM, so make sure you purchase it sometime between 12:00 AM and 7:00 AM.
When you're ready to buy, open the
My Disney Experience app, select the 3 bars in the bottom right, and then 'My Genie Day' to begin. It will read the ticket and park reservation, and you will see a purple "Take Today to the Next Level" on that page with an option to add Genie+ there. You should also see a Tip Board showing attractions for the parks (tap "change park" if needed). Starting at 7:00 AM, refresh the screen so you can see what Genie+ Lightning Lanes are available. When you find one you like, select "Book Experience."
You may continue to make one selection at a time throughout the day. If your complimentary theme park ticket includes the
Park Hopper Option, you can select arrival windows across multiple theme parks! When you're getting ready to Park Hop, open up the Tip Board and change which park you're visiting. Then you'll be able to see Genie+ selections for 2:00 PM and later; you can even do this before you get to your next park! Just make sure you have a portable charger for your phone, as battery life can deplete quickly when you're having this much fun!
I hope this helps, Andy! If there's anything else you need, remember, "You've got a friend in me!"
Eean