title: How to access and edit HTML Wordpress code?
body: <p>I'm working on a project for my studies, building a website with WordPress. The code needs to pass the W3C HTML &amp; CSS check and here arrives my problem. I get tons of errors and warnings, and I don't know how I can edit the code and fix them.</p>
  
  <p><a href="https://i.stack.imgur.com/eoSpt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eoSpt.png" alt="enter image description here"></a></p>
  
  <h2>#1</h2>
  
  <p>I have tried the <em>Appearance</em> -> <em>Editor</em> thing, but I only have access to <code>style.css</code>, <code>functions.php</code> and <code>wpml-config.xml</code>. Plus, I don't have the rest of the CSS code, only what I wrote. (I'm using a child theme)</p>
  
  <p><a href="https://i.stack.imgur.com/Plwor.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Plwor.png" alt="enter image description here"></a></p>
  
  <h2>#2</h2>
  
  <p>I tried with the Chrome console to locate the mistakes by copy/pasting the code, but the Chrome console says it is on a different line from what W3C tells me. I sometimes don't even find it.</p>
  
  <p><a href="https://i.stack.imgur.com/smmJC.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/smmJC.jpg" alt="enter image description here"></a></p>
  
  <h2>#3</h2>
  
  <p>So I tried to download the site files with FTP, but there is nothing written in <code>index.php</code> and other documents unlike what is shown on the Chrome console.</p>
  
  <p><a href="https://i.stack.imgur.com/5p29H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5p29H.png" alt="enter image description here"></a></p>
  
  <h2>#4</h2>
  
  <p>My question is pretty simple, how can I access the PHP/HTML/CSS code of my website, and modify it?</p>