The question makes no sense at all. You cannot change Web site content even with refreshing the page.
The content can only be changed on the server side, but of course it can be done on the behalf of the client, and only if the server-side script is designed to do so.
Don't get me wrong: you can change the content of the page on the client side by changing DOM via JavaScript. This is not considered as "changing the site"; the change will not go outside of the browser.
Now, "step by step instructions". I often had similar questions and developed some protection against them: if such instructions were possible, people would develop some software which would simply do these steps without your help. Isn't that simple. No, no instruction can help you. You just need to learn how Web works; there is no other way. Take this Ajax:
https://en.wikipedia.org/wiki/Ajax_(programming)[
^],
http://api.jquery.com/jquery.ajax[
^].
That's pretty much all about Ajax. (Of course, there are different frameworks based on it, but essentially that's it.) It will seems mysterious to you until you understand: it does nothing at all without some server-side technology. It's all about getting HTTP request and processing it into some HTTP response, which can involve some
side effect. This side effect, and nothing else, can change the side content. For example, you can add some files to the part of file system under the root directory set up for your site, or modify some files. A partial case of such modification would be the change in some database, which can be on a separate
tier. Only if you do such
persistent modifications, you really change the site's content.
So, here is another reason to say that there is nothing to instruct you about: first, you need to learn some server-side technology and choose one, or some options for a decision. Otherwise, there is nothing to talk about. So, is some "step by step instructions" are possible, they are reduced to the two: 1) learn how Web works, 2) learn some server-side technology.
If you face some problems on this way — welcome back to your questions.
—SA
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