How to hide if I'm offline

http://prntscr.com/ntppv9, http://prntscr.com/ntpq08, http://prntscr.com/ntpq56

desactivas la casilla y solo el Fundador y los administradores de tu tribu veran tu actividad

To elaborate on what sangre_azul points, your online/offline status can only be seen by your peers in your tribe. To disable this, follow the images that sangre_azul posted above. People that do not share your tribe will not be able to see your online status, unless they have performed the Oracle Feast (available during the Bacabs' Crystals event) which does allow to uncover the online status of anyone for a brief period of time.