Can't get Safestrap to load...

I'm having a lot of trouble getting my phone to boot into recovery mode. This is my first attempt at rooting and loading a custom rom on any phone.

AT&T Note 3
Rooted with towelroot
Samsung-SM-N900A
Android version 4.4.2
N900AUCUCNC2
MDF v1.0 Release 2

I've installed towelroot and rooted the phone. I've installed SuperSu and Busy Box. Safestrap installs with no issues but when I reboot the phone goes right back to the regular AT&T boot.

Any help would be appreciated. Thanks

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