[Build] Rogue - Flash Farmer - Max Gold Find, Item Find, Luck, with Crystalline, Eternal and Nadroji Set Affix, Mythic 3 Level 500

Hey guys, I just started playing today. Maybe you can answer my simple question?
Click here to see my Thread at Support Q

I just started today, and I saw some video about the Rogue Flintlock Build (Is it correct?)

Mine is only releasing 1 bullet. How to make it to 4 or 5 bullets?
Just like the Video of this guide? (Hope someone can teach me)