I need to set a redirect for www.rssic.com/about-our-team.html to go to www.rssic.com/our-team.html.

I tried using Manage SEF URLS but so far have been unsuccessful. These legacy URLs were picked up years ago and are being used by outside websites to direct traffic to my site, I reviewed documentation that came with Joomsef but cannot seem to find a clear step by step way to do this.

Hi,
You can use the Manage 301 Redirects page in JoomSEF for this. Create a new 301 Redirect and set it like this:
Moved from URL: about-our-team.html
Moved to URL: our-team.html