If you are doing it yourself, the simplest way to make changes to a basic HTML website is to login to your cPanel, and click on the "File Manager" icon.
This is a very simple, and easy to use file / web page manager, with the ability to modify web pages just like in a Word Document type format!
If this is beyond your skills, we suggest hiring our great team for a very affordable price:
we offer many great Web Design packages: