The easiest way to install an apk to your phone is to connect it throught USB to your computer and then, in a console (on your computer), do:
`adb install yourapk.apk` (where yourapk.apk if your apk file).
If there is some error because this apk is already installed on your phone (or an apk with the same package name), it will give you an error with an understandable message.
(the error you have in android strudio is because you are missing some android sdk. But you don't need it as you don't want to compile your project here. If the build succeed without error in the cn1 cloud server, there is no reason why your apk couldn't be installed on your device (exept if you have a really old android device running a version of android not supported by cn1. What android version do you have?))