How do i take back my Free/Data mode bar in my Facebook?

[Chaexypark97]

How do i take back my free/date mode bar in facebook? I've lost it! It just suddenly logged out! I tried to use "Free facebook.com" in Chrome but when i search for it, it loads so slow. Doesn't mean i have a low signal and i suddenly saw "Mobile facebook.com" how? Can someone help me with this?