I'm new at this so I'm not sure what I am doing. How do I go about loading this? Un-install ROM Manager first?
I would uninstall ROM Manager first, yes. Before we start, I'll need to know how you rooted? And did you take the latest OTA (the one with Sprint's Connection Manager - 5.07.651.1)? Depending on the method you used, the below procedure might not work (you could get a "Main Version is older" message). However, I'll post the procedure here anyway, as it will still apply. It's possible I'll just have to make you a file that will work specifically for your situation.
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Download one of the PC36IMG.zip versions of smelkus' recovery (choose whichever theme you prefer). Copy the file to the root (not in any folders) of your sd card, and rename to only "PC36IMG.zip." If your file explorer is hiding extensions, you will not need to add the ".zip."
Once that's done, make sure fast boot is disabled (should be under Settings -> Applications). Power off the device.
Once the device is powered off completely, hold the volume down button, and press and hold the power button until the HBOOT screen appears. After briefly showing a menu, it should automatically read the PC36IMG.zip file from the sd card, and ask you whether you want to update. Choose "yes". After the update is complete, choose "no" to the reboot question, and then choose "Recovery" to boot into your new recovery.