I have a 2012 Nexus 7 running 5.1.1 and I was wondering how you install TWRP after rooting? I rooted my device using v2.1.0 of the Nexus Root Toolkit with the "custom recovery" box checked and it said it would flash TWRP. My bootloader is unlocked.
I am new at rooting and maybe I don't know how to get to TWRP. You shut down the device, you hold Power+Volume Down for 5 seconds or so and you enter a screen that says start next to an Android guy. I used the volume keys to scroll to Recovery and pressed Power for Enter. Everything after that was just how it was before the root. I want install CM 12.1 and I want to be sure I have TWRP flashed already so I don't to flash again.