As writen in the last page of the install guide (after the page about porting) the info you need to connect is:
IP: localhost
port:5900
For Ubuntu
Password: ubuntu
For Backtrack
Password: backtrac
For Debian
Password: debian
The password you set it your password for your user account not the password for vnc.
Some times when you buy and install a donation key the main app gets 'stuck' in free mode and so the donation key features do not get unlocked. This is something we are working on but for now a easy fix is:
You should now have the extra features unlocked
This is a error that I have been getting reports about on the market error reporter. It has a very simple fix which is in fact in the app market description, but I shall repeat it here.
In order for the widget/button to not force close you MUST have this terminal app installed on your device: https://play.google.com/store/apps/details?id=jackpal.androidterm
If the terminal is included in your ROM this will not work (As it is installed in the system apps and not normal apps) so you will need to delete this and reinstall it from the market.
You must also make sure you have the newest version of the terminal installed as older versions of the terminal will not work.