Firstly i want to ask you; Where want to show your mood, in single post or site index or both of them? If you want to show this in single post just modify your theme’s single.php, if you want to show this only in index, modify the your theme’s index.php or you want to show in both of this areas, modify index.php and single.php together.

Just Copy this code below and paste it in index.php or single.php‘s loop areas (After your article ord before article, where you want).

Here is the code;

$customField = get_post_custom_values("mood");
if (isset($customField[0])) {
echo "My Mood: ".$customField[0];

Now Just create a customfield with named ‘mood‘ and add this custom field when you write an article.