Let me see if I can help.

Where did you save the file. Make sure you navigate to the folder where you saved it. As mentioned in the how to, I saved it in /home/user/. I would run the script with:
#/home/user/./btup

You can find your BT mac address by going into the settings on your phone or searching for nearby BT devices with:

#hcitool scan

The scan will come up with all BT devices in the range that allow devices to see them so you may need to find it on your phone.

Try the ./btup instead and post back with any issues. We are here to help. I have an N800 now so I can't help you trouble-shoot but may be able to lead you into the right direction. Trust me, I had a heck of a time getting it figured out on my old N770 but once I did, WALA!