You should now have a final, clean version of your online store, with a copy of the database, all zipped up and ready to go. Assuming there are images and a fair bit of data held within the site, you can be sure that the size of the upload is quite substantial. For this reason, you need a reasonably high speed connection—dial-up connections can be slightly erratic over long periods of time, so it may even be worth using a friend's computer or your office connection to send the files to the host site.
By far the easiest method would be to use a native upload feature from the host's file manager over a quick connection. If this is available to you, simply use it to upload the archive file across to the host server. The demo site has this facility as shown here:
Notice that the ZIP file is being uploaded to the public_html
folder, since this is the document root from which all web pages on this server are served.
Alternatively, assuming your site has an FTP account enabled, you can either attempt to use FTP drag and drop, which is exactly the same as moving files around on your PC in Windows, or you can use an FTP utility.
When in doubt, simply get in touch with your host service and ask them for information about how to transfer files. The administrative interface and file manager for the vast majority of sites are easy to use, and you will have no problems uploading files. Because of this, we won't waste time discussing FTP utilities in detail. Simply ensure that, ultimately, the ZIP file ends up in the document root of your host's server. Remember not to leave the zip folder lying around in the document root once it has been used.