First off, I’ll start the same way the instructions do:
Please read each and every step in this guide and do them fully failure to do this exactly as it is layed out could result in a permanent brick as usual I am not responsible for anybody’s failure to read directions.
Now that we got that out of the way, welcome to the root club, HTC EVO Shift 4G. While not the easy one click process of many other HTC phones, you can now permanently root your EVO Shift 4G by following a few command lines with ADB. Head over to the xda-developers thread for full instructions.