How to Format Memory Card in Samsung Galaxy Grand2(SM-G7102)?

a). Tap on Apps as shown below :

b). Tap on Settings. Under Settings option, tap on General as shown below :

c). Tap on Storage option as shown below :

d). Now tap on Format SD card as shown below :

e). Tap on Format SD card again and then tap on Delete all as shown below :

Your SD Card is formatted and all the data from the SD Card is erased permanently and cannot be regained now.