creating SSL in soapUI for loadUI

I am very new at web service and load testing and was recommended eviware open source tools. Can anyone explain (in as basic terms as possible) how to set up an SSL connection with the web system I am trying to test. Basically I have a website that requires certificate login and I have no clue how to start. Once the SSL is set up I'll need to run a load test but first things first. Any help is much appreciated