Installing kernel extensions?

I'd like to install the SpeedIt kernel extension, which doesn't come with an installer. When it comes to unix, I'm an idiot, I know nothing. So how do I go about installing it? The "read me" included simply included 4 commands:

chmod -R 755 speedit.kext
chown -R root:wheel speedit.kext
kextload speedit.kext
sync;sync;sync


I did this from the Terminal start up and of course, it said I couldn't as I'm not root. So, I logged in as root, but now I can't seem to get to the right directory. I try using the first command and it tells me it can't find that directory. Help?

 

Hardware Monitor is a sham. Or, a nicer way of saying it is I'm not willing to pay money for what it offers. I got the kernel extension installed myself, after a little messing around. It only gives one temp, which is pretty lame but oh well. I'll wait for iStat Pro to include it's own sensors.