Stuck mid-way through Root process (Samsung Galaxy S3 SCH-1535) Root Instructions

I've been following the root instructions above. I'm at this step:

Using your custom recovery flash the download you chose above from Step 1 (#3)

However, I had forgotten to move the SU/Bootloader zip file to my SDCard (not a removable SD, the system SD). So I connected to my mac, used android file transfer to move the zip file to the SD card root directory (/sdcard/), and rebooted into recovery mode. 

Now I'm in the samsung recovery mode (3e), with the little android fella and the red triangle, (manual mode), and if I select 'external storage', obviously since I don't have any (no removable SD), I can't seem to get to the file.

The first time I had rebooted into recovery I had gotten this screen:

TWRP Screen

But now I can't seem to get back to that screen to attempt to install the Super SU and Bootloader zip file. 

Help?
I'll put this here so you can mark your question as answered.

Some phones' stock ROMs automatically replace custom recoveries with the stock ones on boot, so when you rebooted to put the ZIP on your phone, TWRP was wiped away. So, simple, reinstall it.

As for a good ROMs, I use ParanoidAndroid on my Galaxy Nexus and I love it.