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You need to use the [update_post_metaupdate_post_meta()][1] (Codex) function:
[update_post_metaupdate_post_meta()][1]
<?php update_post_meta($post_id, $meta_key, $meta_value, $prev_value); ?>
What are you trying to do, that isn't working?
You need to use the [update_post_meta()][1] function:
[update_post_meta()][1]
You need to use the update_post_meta() (Codex) function:
update_post_meta()
