Chimbles, it works exactly as the Captain says.
In a very early incarnation of the app, there was a special tab for it, but the reason why we ended up doing it this way is because we want to make the app airfield centric. I.e.: you pick an airfield and then all the info that is available for it.
We're actually working on sourcing data for non-ERSA airfields, which would then also appear in the list if you have that option enabled.
We always love hearing any feedback and your suggestions to make the app better and more useful!