What are the tabs at the top of the standard mode pages

The name of the page I'm working on is index.php (it's the index page for the speech and debate category).

Homeschool Speech and Debate

I am in Standard mode. At the top are 5 tabs:

source code

head.php

header.php

christianlogic_add.php

footer.php

I can work on the text of the index page when I have the "source code" tab clicked.

What I want to do is make the image (of a book cover) link to an Amazon affiliate link. I want these words under the image of the book: The Fallacy Detective: Thirty-Eight Lessons on How to Recognize Bad Reasoning.

Someone here on the forum said to use this code:

<p class="ImageRight">

  <a target="_blank" href="https://www.amazon.com/gp/product/097453157X/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325& creativeASIN=097453157X&linkCode=as2&tag=trivium0d-20&linkId=bc010dfd1a2b40954223654790802 58b">

  <img src="http://www.triviumpursuit.com/images/christianlogic_catalog_thefallacydetective_2014_cover _medium.png" width="168" height="230" border="0" /><br />

  The Fallacy Detective: Thirty-Eight Lessons on How to Recognize Bad Reasoning

  </a>

</p>

If I click on "head.php" it says, "head.php is not on the local disk." If I click on "header.php" it says, "header.php is not on the local disk." Same with "footer.php". If I click on "christianlogic_add.php" I get the code I think is for that image of the book cover, so I pasted the suggested code and saved.

If I make changes to any of the text of the page and then "put," the changes are made properly to the web site, except the changes to the image don't take. I must need to "put" on something else.

This statement is also at the top of the page, "This page may have dynamically-related files that can only be discovered by the server."