You can't do this on the Rhodium, there is no full ROM version of Android working yet for this phone.
The ROM you linked is for the Kaiser. ROMs are for specific phones. Flashing the ROM for the wrong phone is a very bad idea. If you flash that ROM to the Rhodium, it won't work and you will probably brick the phone.
Your best bet is Project Android. This is not a full ROM, but rather installs the the SD card. You boot it up, and it dumps Windows Mobile, and loads Android.
Please click the "Thanks" button if you found a post helpful!
Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)