How to install Lijit Ads

I’m ordering if anyone would be able to help me figure out how to install an add on my page. I signed up for the LIjit ads and my its was approved. I was able to get a install script that looks like this:

“<script type=”text/javascript” src=”https://ap.lijit.com///www/delivery/fpi.js?z=231712&u=proshapefitness&width=300&height=250″></script>&#8221;

However, I’m completely useless and depute hours of googlin I can’t get the ad to appear in my sidebar. I would have thought that I could use a text box widget but unfortunately this did work. Not sure where I should place this script. I would REALLY appreciate anyones help who know! Thanks!!