Best Way To Add Sitemap

I am not the programmer that developed my software but I do have basic knowledge with CI. I want to add a sitemap to my website and I'm not sure how to do this. I Googled a bunch of code and nothing seemed to work. Initially I created a sitemap with another website and tried to upload it. I couldn't find where I should put the sitemap or what to configure to point CI to the sitemap. Ex. website.com/sitemap.xml. How do I go about doing that or should I use a script to generate the sitemap. I'm sorry if this is a really basic question!

Thanks,
BradM.