stratum+tcp://stratum.kano.is:3333 should work fine. You may want to ping all the connections to see which one is the fastest for you.
If you are not sure how to ping, log into one of your machines, click on the Network tab and then click on the Diagnostics tab. Ping each of the Kano links below and note the average speed it takes and use the fastest as your main link. It's also a good idea to use main stratum link as one of your backups just in case the node you choose to use goes down for some reason.
stratum.kano.is
de.kano.is
sg.kano.is
jp.kano.is
nl.kano.is
nya.kano.is
The format to use any of these is:
stratum+tcp://stratum.kano.is:3333
stratum+tcp://de.kano.is:3333
stratum+tcp://sg.kano.is:3333
stratum+tcp://jp.kano.is:3333
stratum+tcp://nl.kano.is:3333
stratum+tcp://nya.kano.is:3333