Hi Den
The Tablet is Android OS? If so, selecting the APK from the Tablet should trigger the Android installation process.
If you are debugging the APK, your Android Device should first be in Developer-debug mode. Search the internet for your make/model to find out how that is done (usually requires repetitive tapping of a menu item).
If you are installing a finished version APK, then set your Android Device to allow installation of APKs from "unknown sources" (in this case, since you are not Google or Amazon, you are the unknown source).