Install odin and place the twrp file in ap section of odin and uncheck autoreboot option Enter the download mode by pressing volup and voldown button simultaneously and connect to a computer after that you see option like device unlock mode press vol up to continue long press vol up to unlock the bootloader you must unlock the bootloader to install twrp Note- after unlocking the bootloader your phone will erase everything and your warranty will lost if you lock the bootloader you warranty is safe. go and research somewhere before doing something if your device got bricked we are not resonsible
