Thanks trenton for your help. So I switched to coinmine.pl now.

The mining is working but I'm not sure if I configured it correctly. My last command I typed in was:
./minerd -a quark -o stratum+tcp://mine2.coinmine.pl:4020 -u Weblogin.Worker -p Worker password

I got this command from the Getting started page at coinmine.pl
Is this the right command to mine Frozen? Or how does the mining process know that I want to mine Frozen? (Sorry if that's a newbie question)

Also in my coinmine.pl account under the section "workers" there is a dark X under "Active" of my worker. Shouldn't the worker be active when I'm using it during my mining process?

EDIT: OK never mind, it's working fine and I even got my first Frozen reward there