How to Root a G2 which has TWRP installed?

Hi there!

I'm a beginner and I would be grateful if you could help me with this.

While trying to install CyanogenMod, I rooted my G2 using ioroot and then install Autorec. At this point I made a mistake and recover KitKat stock with Autorec, loosing root privileges. Now when I try to root using ioroot, the device shows me the TWRP menu.

I am stuck here. How could I root and install CyanogenMod????

Thanks a lot!!! Please let me know if this is not the right place for asking this in the forum.