Want something other than Kingdom topic

I have a sprint htc evo design with the kingdom bootloader or whatever it is... Is it possible to change this to something else so that I can experiment with other Roms? I have CWM 6 Recovery and have installed xFuZiiOnZz-4.3.2 which is the newest Rom that I could find for my device. I'm very new to all this but am pretty computer literate so I can do thing like this...but want to switch to something different than Kingdom....

Jeremy