Default [Q] Having both supersu and superuser?

Okay from the beginning. I first tried to root my galaxy s4(mk2) using klingo. That pushed the weird Chinese version superuser and put the custom boot logo on. Strangely though i still didn't have root access (tried checking with root checker said i didn't have it). So then i was like whatever and continued on with my day. After three or so days i came across this root method: . So I did it step by step, it pushed supersu onto my device but i still don't have root access and it doesn't let me uninstall superuser or supersu. Any ideas of how i can get root and/or uninstall superuser and supersu and getting rid of the custom boot logo.