Default [Q] how to set blinkfeed as lock screen

I just got desire 600 , I know this forum is for HTC one, but since the prior has blinkfeed in common with the earlier , I came here .
The problem is when i press the power button , a wallpaper appears and i want the blinkfeed to appear instead of wallpaper like before .
despite i set blinkfeed as home lock screen , the wallpaper still turn up whenever i try unlocking that thing .

please throw any light on this