Galaxy S4 SOS topic

Hello
i have att galaxy s4. android ver 4.3 BV: I337ucuemk2 build version:jss15j. I337ucuemk2

can you help with guide AtoZ how to room my device?

also i started the rooming but a even cant root it, i try "New Root Method for AT&T Samsung Galaxy S 4 (OTA MF3 + Safe update to MK2)" from her:
it says permission denied . (yes i did the EXFAT format).

i looked up for more info but its looks like to me there is non...

i will appreciate any help...
thank you