Go Central HTML scripting sitemap

Good Morning, I'm trying to add a xml sitemap to my website. I'm currently using the GoCentral Website builder. I can't see where to do it anywhere. I called GoDaddy and they didn't know what I was talking about. Basicalliy I want Google to be able to crawl my website better. I belive setting up a site map and submitting it to the google search console brings far better search engine results.


Can anyone give me any pointers please?