On the iPad the settings are joint together with the source selector:
The Navigation Data
By default AirTrack comes with an old 2001 AIRAC data cycle. The data can be updated to a more recent cycle using the built-in Navigation Data manager page. If you want the latest and most up-to-date AIRAC cycle for your FMC and flight sim experience, you can visit Navigraph, purchase an FMS Data set. Within the FMS Data Manager app there will be a pop-up which says "Show Access Code for ..."; select AirTrack and note down or copy-paste the token.Then select "Navigation Data", submit your token and download the FMS data directly into your device or paste it to the Navigation Data section of this web site (after logging into your Air Account) to make it available on your device automatically.
Please note that the data is for flight simulation only and must never be used in real flights. The data, even if current, may differ from the official published data.
In addition and alternatively to this you can also download the free FAA CIFP (Coded Instrument Flight Procedures) for free, although these only cover the US.