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I added the template tag to my template and the post has the custom field I'm asking for but I don't see anything about it on the page; what gives?

Did you echo the return value of the function, e.g. <?php echo c2c_get_custom('mood', 'My mood: '); ?>

Can I achieve all the functionality allowed by the six template functions using the widget?

Except for c2c_get_custom() (which is only available inside "the loop"), yes, by carefully setting the appropriate settings for the widget.

How do I configure the widget to match up with the template functions?

• c2c_get_custom() : not achievable via the widget
• c2c_get_current_custom() : set the "Post ID" field to 0, leave "Pick random value?" unchecked, and set other values as desired.
• c2c_get_post_custom() : set the "Post ID" field to the ID of the post you want to reference and set other values as desired.
• c2c_get_random_custom() : leave "Post ID" blank, check "Pick random value?", and set other values as desired.
• c2c_get_random_post_custom() : set the "Post ID" field to the ID of the post you want to reference, check "Pick random value?", and set other values as desired.
• c2c_get_recent_custom() : leave "Post ID" blank and set other values as desired.

Why can't I see the widget or shortcode builder as mentioned in the features listing?

Those features are only available if you are running WordPress 2.8 or later.