How do I perform boot editing in Windows 7?
It depends what you want to edit? if you just want to change the boot load order on a dual boot system, you can use Control panel/Advanced Settings/Advanced/Startup and recovery.
if you want to modify start-up parameters you could use msconfig, just run the command from start menu/run.
if you want more options use BCDedit, which you run from the command prompt, just run bcdedit /? for help. There's also a similar utility called EasyBCD but it has a graphical UI