@voodootech, the WPremix templates are static PHP files with example text and images in them. Apparently, the author intended to release a plugin allowing users to edit that text via the wp-admin interface, but that never happened.
Many people still find the WPremix theme very useful, but it does take a bit of HTML knowledge.
What I recommend is creating WordPress-Page versions of each PHP template. Granted, people who purchased a theme shouldn’t have to do this, but it seems the be the best option.
1. Start by creating a WordPress Page that matches the name of one of the WPremix template files (ie, “tpl_home01”).
2. Open the corresponding WPremix template file, and copy the main theme content (usually located between <!--content #start -->
and <!--content #end-->
comment tags).
3. Paste the code into a your WP Page (in HTML view).
4. Replace the code you just copied from the PHP template with “the loop.” It’s always a good idea to make a back-up version of the template file before changing it. The simplest form of the loop looks like this:
<?php
if (have_posts()):
while (have_posts()):
the_post();
endwhile;
endif;
?>
That ought to make the WPremix code editable in wp-admin. Keep in mind that many of the WPremix template files contain PHP tags, which will not work in your wp-admin editor. You will probably have to replace them or remove them entirely.
Good luck, I hope my info was helpful!