Hello Danny,
Certainly, there is no tutorials about how to publish in the stores. However, I can say something about it. For the case of Android, the things are more or less easy, because, the point os to get our app's APK file. And we can do this directly from Windows, that is, we can compile our app's APK using Apache Cordova (with the stuff provided by DecSoft App Builder) and finally get an APK file ready to be upload into the Google Play store. Basically, in order to be published, we need to prepare a "release" APK, instead of a "debug" one. But, once we do that, it's a question to use the Google Play store account to upload that APK, following the steps that we can see in our Google Play store account.
Talking about iOS the things are a bit different. Apache Cordova can create IPA files of our apps in Mac OS, however, what I do for my own iOS apps is to use the XCode IDE. So, the steps that I follow are more or less these ones: 1º Compile the app in Windows, so we get the "compiled" directory, with "shell" files ready to compile the app with Apache Cordova on iOS. 2º So we move the "compiled" folder to a Mac OS, and, then execute the "debug" shell file created by DecSoft App Builder in a Mac OS computer. 3º Once we do that, that is, once Apache Cordova compile the app with that shell file, what we get is an entire project ready to be opened by the XCode IDE.
Once we have the project opened by the XCode IDE, we must choose the "Project / Archive" in the menu. Then the IDE offer to use various ways to distribute our app. I can't help you in order to publish in the store, precisally, because the apps that I develop for iOS are distributed (from Project / Archive) using the "Enterprise" option, which is a bit different than to publish in the store, however, certainly when use the "Project / Archive", there is an option to distribute the app into the Apple store. So I think it's a question to follow the instructions... select that option (Apple store) when "Archive", and follow the steps that the XCode IDE requires.
Maybe you can try all the above, and, also search in the web about how to publish in the Android Play store and the Apple store, I mean, the instructions that you can get, probably can be used without problems also for our DecSoft App Builder apps, since finally what we get are APK files (for Android) and IPA files (for iOS), so, at this point the publication in that stores do not differ from another apps made with other possible tools. What you can do is to go ahead, Danny, and, if you find some particular problem or question, just post here or in a new thread, so I will try to help you at that particular point.