I was signed out of my google account.HOW do i sign back in ?

[AC Question]

Tried to open FACEBOOK. Received message that i had signed out of google. I did not , Now, I DON'T KNOW HOW TO SIGN BACK IN.I NEED HELP ????!!!!@

 

[B. Diddy]

Welcome to Android Central! Which phone? Go to Settings>Apps, select Facebook, and Clear Cache/Clear Data, then Force Stop. Now open it again, and log in like you normally would. Does the problem still happen?