Default HELP! Custom Bootloader Shenanigans

I successfully rooted my AT&T Samsung Galaxy S4 (quad-core variant) running Android 4.3 using Kingo. However, upon attempting to install both Clockworkmod and TWRP (the latter after failure of the former) as custom bootloaders to use in recovery mode so I can flash CyanogenMod (my eventual goal), something went wrong, I think. Every time I try and go into bootloader recovery mode I get the standard commands but the center image is an android on his back with a red triangle and the words "no command". Have I messed up? How do I fix this and install a custom recovery?

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