Dear Marta Asolas,
Please check your configuration on Virtuemart component again. I will check every your issues:
1. I checked on your backend, you chose "Displays 'Notify Me' instead of 'Add To Cart' button" in Configuration -> Shopfront, please choose 'Products Out of Stock are orderable, no special action'
2,3,4,5 your shop required you login, because you chose 'On checkout, ask for registration' and 'Only registered users can checkout' in Configuration => Checkout
About 6: Please go to the file: your_site\templates\sj_viste\less\your_css.less and add the code:
div.yt-alert div{height: 26px !important;}
7. Please choose None Editor and paste the code:
<div class="yt-socialNetworking">
<div class="yt-socialbt">
<div class="socialbt-inner">
<a href="http://www.facebook.com/SmartAddons.page" class="sb facebook flat color " target="_blank" >
<i class="icon facebook"></i>
</a>
<a href="http://www.facebook.com/SmartAddons.page" class="sb facebook default min " target="_blank" >
<i class="icon facebook"></i>
</a>
</div>
</div>
<div class="yt-socialbt">
<div class="socialbt-inner">
<a href="https://twitter.com/#!/smartaddons " class="sb twitterbird flat color " target="_blank" >
<i class="icon twitterbird"></i>
</a>
<a href="https://twitter.com/#!/smartaddons " class="sb twitterbird default min " target="_blank" >
<i class="icon twitterbird"></i>
</a>
</div>
</div>
<div class="yt-socialbt">
<div class="socialbt-inner">
<a href="https://plus.google.com/u/0/103151395684525745793/posts " class="sb google flat color" target="_blank" >
<i class="icon google"></i>
</a>
<a href="https://plus.google.com/u/0/103151395684525745793/posts " class="sb google default min " target="_blank" >
<i class="icon google"></i>
</a>
</div>
</div>
<div class="yt-socialbt">
<div class="socialbt-inner">
<a href="/joomla25/sj-viste/ # " class="sb rss flat color" target="_blank" >
<i class="icon rss"></i>
</a>
<a href="/joomla25/sj-viste/ # " class="sb rss default min " target="_blank">
<i class="icon rss"></i>
</a>
</div>
</div>
</div>
To your module 'Social Networking' in 'left' position
Thanks