There is no direct way of exporting to Android/IOS, you have to use other software:
3 methods are listed below:
Download and install Intel XDK then:
In C2 export to Cordova, Open in inxtel XDK, set up up your signing keys, plugins etc, and build for Android
Sign up to Cocoonjs, then:
In C2 export to Cordova, Zip your exported www folder, then upload that zipped folder to Cocoonjs, set up your keys plugins etc, then compile for Android
There is a software that converts HTML to APK that is free to use (Google HTML to APK praveshagrewal), but I don't think that will let you add plugins, its probably the quickest and most straightforward option for a very simple app.
For that you will need to export as a HTML website.
All of these will give you APKs which you can then submit to the google play store
If u just want to do some quick testing, you can set it up to run on your deice via wifi (Preferences -> Preview -> Preview server)
Hope that helps