Ok well assuming you're just modifying the JA_Purity template, (which origianlly looks like the image below), here we go.
- The header image as in the the faded image at the top? is in templates/JA_Purity/images/header/ there is three off them because they are set to rotate. SO if you want 1 static image either replace all three with the new image you want OR go to templates/JA_Purity/index.php and repleace
Code:
<div id="ja-header" class="clearfix" style="background: url(<?php echo $tmpTools->templateurl(); ?>/images/header/<?php echo $tmpTools->getRandomImage(dirname(__FILE__).DS.'images/header'); ?>) no-repeat top <?php if($this->direction == 'rtl') echo 'left'; else echo 'right';?>;">
with a standard<img> wrapped in a <a>
- Adding links to the Main Menu on the left is simple. Assuming you want to create a new page, log into your back end -> Content -> Article Manager -> New and create the page you want. Give it a title and some content and give it a section and catagory, (prob best if you just put it in About Joomla/CMS at the mo), make sure it is set to punlish and save it. THEN go to Menus -> Main Menu* -> New -> Article -> Article Layout. Give it a title and alias and in the left hand menu point it at the article you just created and hit save. All going well you should now have a new link on your main menu below 'New Feeds'
- External Links where? In an Article or on a menu? On a menu simple create a new menu item but instead of pointing it at an article you click external link instead. Inside an article highlight the text you want and click the link button in the middle of the second row, enter your hyperlink details and hit ok. Or switch to HTML and enter it manually.
- Which background do you wish to change? It will probably need tweaking but as a setting off point go to templates/JA_Purity/CSS/template.css and find #ja-contentwrap there a few of them around the 875th line. Add a background colour to some of them and experiment