<!--In the html add this some where -->
<script type="text/javascript"> 
  var addthis_share = { templates: { twitter: 'check out {{url}} (from @example_dot_com)'}, url:'http://www.mywebsite.com' }
  var addthis_config = { ui_email_note: 'you custom message here', ui_email_to: 'you@yahoo.com', ui_email_from: 'me@yahoo.com' }
</script>
 
<!-- AddThis Button BEGIN (Some where in the html)-->
<div class="addthis_toolbox addthis_default_style addthis_32x32_style" >
    <a class="addthis_button_facebook"></a>
    <a class="addthis_button_twitter"></a>