am i twrping this wrong?

im trying to install cm on my first ever smart phone and im following this guide here: https://youtu.be/goxDX_bTUFc?t=3m33s

i got stuck at the twrp part which is at 3:33. After i do everything as he explained but when I go into recovery mode, it just goes back to that screen with the green robot laying down (i think this is the bootloader menu).

so im kind of just stuck here..