How do I get my free XML sitemap url uploaded to my free GBBO website?

[pennywishes]

Hi I am completely new to websites.  I am trying to set up an information website for my daughter pre-school.  I have set up the website through googles Getting British Business Online free website. www.wellsandwychepreschool.co.uk  Now I want it to be actually found on googles search engine.
I have found out I need a 'sitemap' to do this so I now have Googles Webmaster Tools.  I also have a site map for my website from XML's free sitemap generator.
What do I do next??  Its says I need to upload my sitemap to my website before uploading it to webmaster tool, but i can't work out how to do this on my website, there are only a few things I can edit and nowhere can I find "public_html/"    Is this because it is a free template website??
Please can anyone help me?   

[XML-Sitemaps Support]

Hello,

you should put sitemap.xml file to your website, similar to how you upload other files to it (assuming you do).