Idea blade is customized version of ZTE blade.Though ZTE blade supports Cyanogenmod Idea blade do not supports changing ROM. Idea blade has only 256 mb of ROM. Even clockworkmod cannot root this phone.
Here is a method to root Idea Blade. Install Z4root and it facilitates rooting of this device. This software supports both permanent and temperory rooting. Install this software and permanently root your phone. Once rooting s done with, system will reboot.
Additionally you can remove the preinstalled softwares from this device. Install Root Uninstaller from Android market. You can remove the unwanted or not frequently using softwares and games etc. It is recommended to remove the preinstalled launcher and replace it with Launched Pro for better performance.