Rooting LG L90 Lollipop 5.0.2 D415 help needed!

Okay so first of all i was on my phone earlier today and i decided to download and install the KingRoot apk just for the fun of it. Little did i know it actaully rooted my phone and i was very happy because it was easy just like towel root except towelroot wouldn't let me root because my device was " unsupported " so i got into the basics i changed my emoji style to ios , then i downloaded xposed installer . It told me that i needed to update it and stuff and whatsoever . So i found xposed installer for lollipop and its zip file , But since im not really familiar with all this techno stuff i really didnt know how to " flash " the zip file even if i installed TWRP it wouldn't show me that once rebooting . Alsoi guess i had to download something in the app but the LG L90 wasn't in the list . So after 2 hours of watching tutorials i managed to learn that you need to flash an image and alot of difficult things . Also i guess you could also flash via the Lg Flash Tool ?

So What?

Well i still need help flashing the image or whatever you need to " flash " . Like I said im not really familiar with all the terms and defentions . I saw this one tutorial that said you needed the Root Browser ( i have that ) and the 3c Toolbox and have to enter some type of code into the Terminal Emulator . The thing is .. how do i really do that ? I mean the guy on youtube said you had to move the twrp.img file to the /sdcard and then type some code but what code ? I tried the code he used and it didn't work on the emulator thingy . I also tried to script so i can select trwp.img file through there but it gave me a error :/ . Someone help ? If you're helping make yourself sound easy that would help alot . Then again thanks to whoever helps ! :)