Templates can be awkward things to manage. The secret seems to be to make sure that all the paths in it are correct from the start (and that your site structure will not change), and will therefore place the correct paths in all new pages created using it.
Before going any further, could you please create a new page from the template (don't bother putting any content in it) and save the new page in your 'AboutUs' folder, as 'test.html'? Then upload the page to your remote server.
File > New > Page from Template > (your template) > Create
This is just to check the current paths being created by your template. We can go on from there.