How to manage the Data usage in Samsung Galaxy Grand2(SM-G7102)?

a). Tap on Apps icon as shown below.

b). Now tap on Settings icon and then tap on Data usage option as shown below.

c). Tap on Set mobile data limit option to enable and the tap on OK as shown below.

d). Tap on Data usage cycle option and then tap on Change cycle option from drop list.

e). Scroll to the required date of each month by tapping on Arrows and then tap on Set tab as shown below.

f). Tap on Warning as shown below.

g). Scroll to the required data usage warning by tapping on arrow options.

h). Tap on Set tab as shown below.

i). Tap on Limit as shown below.

j). Scroll to the required data usage limit by tapping on Arrow options then tap on Set tab.

k). Now you can see the changes have been saved.