title: How to put own HTML into Wordpress theme?
body: <p>I installed a Wordpress theme, but I would need to put there my own HTML code.
  So, I would suppose I'll go into: <code>wp-content/themes/theme_name/header.php</code> and on the needed place I inserted needed HTML code.</p>
  
  <p>I did it, but it didn't affect the website - the newly put HTML elements are not seen in the website.
  Do I disregard anything? Or is needed to set up something in the WP administration?
  Or problem with cache?</p>
  
  <p>Sorry, maybe a stupid queston, I am just playing with WP for the first time.</p>