I went to Co-Create's website, opendesktop.net.
There I found an apt-rpm tutorial (in Chinese, so I don't know what it says).
You should be able to
apt-rpm install kopete
or something like that.
If it says it can't find it, try adding freshrpms to your sources.list. If you need help, write back. Distrowatch says it is based on Fedora, so any instructions and RPMs for Fedora should work on Co-Create also.