Dianne,
Thanks for asking your question to planDisney!
To order
Genie+ you just need to open up your
My Disney Experience App on your smartphone and you will see a button to do that fairly close to the top of the app home page. You can do this at 7 am the morning of any given park day. That is also the same time when you can make Genie+ reservations as well.
From your question I gather you are staying at a
Disney Resort hotel. Assuming that is correct, you can also make Individual Lightning Lane reservations at 7 am as well. As you may know, you do not have to have Genie+ to make these reservations. They run completely independently.
BONUS TIPI understand your concern about "missing out" on reservations. But everyone is in the same situation when it comes to this system, so you should be just fine. But even if you did not land a reservation for that one specific attraction that you had in mind, remember that this does not mean that you cannot enjoy that ride, or other attractions. Even if you don't get a reservation, they all still do have Standby Lines. On a recent visit I found the wait at the Standby Line for an individual lightning lane attraction at just under an hour. So if you don't happen to get any one particular reservation, don't let that deter you from having a great day!
Write me back if you have any other questions.
Have a Magical Vacation!
Doug