Question about how best to execute manual focusing on m4/3rds, E-M5 specific

Im having a similar problem. If I press function Fn2 I can choose magnify by rotating the dial. It then says to release the button when desired function is selected. Like I say it chooses the magnify option. On page 22 of the manual it then says press the Fn2 button and it will bring up an optional selection to be displayed but I dont get the optional zoom af. Maybe I'm missing something but can't seem to get it set up. Shame as I have a few older Nikon lenses I'd like to use where I could use the magnify to get close in to make sure everything was in focus.
Anyone have suggestions on what I'm doing wrong please let me know.
Cheers