Facebook on Galaxy S 10.5- No message box on right hand side

A

AC Question

Good morning,
Just purchased my Samsung Tablet yesterday and cant get Facebook to show the box on the right hand side with who's online and your friends list.
Have tried different browsers in case it was a screen size/zoom issue as happens with Windows.
there is plenty of room there for the box to be....but no luck.
Have read where you download extra messaging apps, but do these work from within FB on the same page like the original, or seperately.
I like having that box there on my windows PC.
Please help as i'm completely new on Android devices.

Thank you