For file downloads select the "Web root" then click Upload Files. Then choose the "File Upload" the browse button on your machine and upload to the host on the unload button.
To load database files (only .dbf files need upload) need to select the "Database" link and the link to download the database file on the host.
To deploy a web site on the local machine before uploading files, you can use the menu item in Visual Studio to publish the website. Then choose in the proposed dialogue directory where files will be copied publication confirm and get a folder with the published site. After that, as described above can be loaded on the host aspspider.com.