Hi, Lucy, and great question!
If you added
Genie+ to your ticket, even though you will not see mention of the add-on when viewing your ticket on the
Disneyland Mobile App, you would have access to Genie+ once you physically enter one of the two parks. There is no extra step you must go through to have your Genie+ purchase associated with your ticket.
Once you enter one of the parks, hop on the Disneyland Mobile App, then click the Home button in the bottom left-hand corner. On the home page, you will see a mention of the Genie Service and can click “Get Started” to fill out your wishes and start booking Lightning Lanes.
With Genie+, you will also have unlimited
Disney PhotoPass downloads, so make sure to strike a pose as often as possible with a Disneyland Resort photographer and scan the Disney PhotoPass codes onto your Disneyland Mobile App.
Enjoy your time at the Happiest Place on Earth, and please feel welcome to come back with more questions if you think of any.
Best wishes,
Lola