What is your site url?

Adding this in custom css should fix the problem.

.single-navigation{
display:none;
}

I see the text as white in the homepage and black in the post content. Isn’t this what you are looking for?

You will need to uncomment following code from footer.php for enabling the style selector.

<?php // include_once(‘style_selector.php’); ?>

should become

<?php include_once(‘style_selector.php’); ?>

Please pm me the site login and I will check it out.  Btw you seem to be using a very old version of the theme.