A quick Google search of "linux kill process" should give you all the results you need.

In fact, here's the first one that pops up: http://www.cyberciti.biz/faq/ kill-process-in-linux-or-terminate-a-process-in-unix-or-linu x-systems/

If you're not running it as a daemon (in the background), use Ctl+C to kill whatever you are currently running in a terminal.