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Then, view your held posts (a link will appear on the post index) and do all the tagging/rating/pooling/PC you want.

Once you're ready, hit the "activate all posts" button, and it'll release the posts to the index.
The link on the post index is there only while viewing the held image.

Only if you do a holds:true? That is when I've seen the 'activate all posts' button.