There are a few options, but also a few problems. Before you do anything, go to settings/security and tick the 'install apps from unknown scources' box. Download the latest Google Play apk from here, transfer to your sdcard/internal memory, and install it. It should work, but might not be fully functional as you may need Google Play Services as your tablet has not been licensed by Google (nothing wrong there, just cost-cutting by the manufacturer). According to our French forum, the tablet is already rooted which means you could move the Play Store to system apps, but to actually install Google Play Services to an unlicensed device is a little shady, and I can't give you advice on that here. Your other options would be to use the Amazon App Store or another app store (there are a few that don't rely on Google Play being installed, but once again they tend to offer paid apps for free and I won't pass that on here).