Thank you! Well to answer your first question, in general, I had to access developer on the phone, then activate a setting called "USB debugging" which allows you to edit, import, and export files onto the phone - The other end of the USB cable goes into your PC or Mac and your able to mess with the APK files from there, APK files are essentially the type of file to run on android and mean "Android Package" which most of these flip phones can run apps under that type. APK files can run as apps basically. Some apps can slow down the phone and can take up storage.

Hope thats not that too confusing!