In the "Edit Templates" section you can edit LiveCart templates. To edit a particular template:
Note: You can also try Live Customization mode to edit templates directly in the graphical user interface.
Such a system is used to make updates easier - updating the default template files will never change your customized templates. When rendering a page, LiveCart will always use a template from /storage/customize/view, if it is available - otherwise a default template file from /application/view will be used.
So, when editing files, you shouldn't edit the /application/view files directly, but instead store them to /storage/customize/view.
For example, if you want to edit the home page template, you would take it from /application/view/index/index.tpl, but upload the modified file to /storage/customize/view/index/index.tpl. You can also create an initial copy of the template file in the /storage/customize/view directory by saving the template file from backend or using the Live Customization tool.