When you say app, what type of app…
If it is either iOS or Mac Os i.e using Xcode to build the app. Then I would try and use two projects one with the main scenes and one with the guide page. Then use the NSUserDefaults API and the registerDefaults to do what you want.
i.e your registerDefaults.plist has the basic settings.
You check for a entry for ‘guideShown’ = true.
If it does not exist then you are looking at registerDefaults which means you need to show the guide Scene and add the ‘guideShown’ = true. to the User Defaults.
The next time the app launches the ‘guideShown’ = true will exist, which means we are now using the User Defaults. And you can go straight to the other scenes.
If you are talking about a browser app then you may want to look at localStorage.