Hi @Gloria Outland,
If the Facebook app is not installed on your tablet, connect to the [https://www.manualslib.com/manual/631576/Trio-Stealth-G2.html?page=24&term=internet&selected=5#manual|internet via WiFi] and download and install it from [https://play.google.com/store/apps/details?id=com.facebook.katana|here].
I’m not sure if it will install on your tablet or not but have read that it should work on devices having Android Ver.4.03 and higher as the installed OS