Arthemia – How to change tab title and how to fill in

Hi,

I have done a website with WordPress (Arthemia), and now have a wrong tab title showing for my different pages: cf. https://www.celsius-europe.eu
If you click for example on “Activités”, it will show in the tab title “Celcius-Europe >> Activités” instead of “Celsius…”.
Where can I change this?

I also would like to fill in the four boxes (two in red, two in grey-black at the bottom of the “Accueil” page, but can’t really find where to change the code in the index.php file.

Below is what is there so far (from a former programming) – at least I think this is the code referring to these boxes. Could someone help me with that?

Finally, could you also tell me how I can change the title “Accueil”, which is there by default for the homepage of my website?

Many thanks in advance.

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<div id=”middle” class=”clearfloat”>
<?php $display_categories = array(12,13,14,15); $i = 1;
foreach ($display_categories as $category) { ?>

<div id=”cat-<?php echo $i; ?>” class=”category”>
<?php query_posts(“showposts=1&cat=$category”)?>
<span class=”cat_title”>“><?php single_cat_title(); ?></span>
“><?php echo category_description($category); ?>
</div>

<?php $i++; ?>
<?php } ?>

</div>

<?php } ?>