You use a FTP(File Transfer Protocol) software such as the free Filezilla software you install on your hard-drive to upload your website to your hosting account and also you use it when you need to update a page on your site.
Years ago I put together some free basic instructions on using Filezilla. The instructions are at:
[Please contact Neil by clicking on his name and sending an email or private message if interested]
[jgs (moderator): Sorry Neil. Unfortunately we have to maintain a strict policy about self-promotion (posting links to your own material) so I had to remove the link.]