How to change Lock screen Wallpaper in Samsung Galaxy Grand2(SM-G7102)?

a). Tap on Apps icon as shown below.

b). Now tap on Settings and then tap on Device as shown below.

c). Now, tap on Wallpaper as shown below.

d). Tap on Lock screen option as shown below.

e). Now tap on Wallpapers in Select wall paper from list.

f). Now tap and scroll the wallpapers and select the one from the Available wallpapers.

g). After selecting the favourite Wallpaper tap on Set Wallpaper as shown below.