There are a few different ways to uninstall pagekite.py, depending on how you installed it in the first place.
Simply delete the pagekite.py and pagekite.cfg files from your desktop or home folder.
If you installed pagekite.py using the curl-based installer or a manual download, the following commands should remove pagekite.py from your system:
$ sudo rm $(which pagekite.py) $(which pagekite-gtk.py)
$ sudo apt-get remove pagekite python-pysocksipychain
You may also want to edit /etc/apt/sources.list and comment out or remove the line mentioning PageKite.
$ sudo rpm -e pagekite python-socksipychain
If you added the apt repository, you may also want to remove it using this command:
$ sudo rpm -e pagekite-repo...