I rooted my phone back in the spring and tried a couple of ROMs and went back to the original stock version. Back then I used the Odin software. I recently decided to try ROMs again and saw on YouTube where people are using goomanager and it looked easier. Following the video, I downloaded goomanager from the play store.
I just completed S-off sucesfully and installed goomanger > selected install openrecovery script. It downloaded openrecovery-twrp-18.104.22.168-fireball.img. I than got a pop up saying recovery has been installed. I than selected reboot recovery and got a pop up saying, "by clicking yes, your phone will request root and reboot to recovery.