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Hi.
You are correct, there is a "New Members" block.
Go to the admin panel and "Blocks Admin". You will find the block you need listed there.
Click on "edit" to set the block's parameters as you wish, then chose where you want it to appear on the page (left, right, centre). Once you have done that make the block visible by changing "No" to "Yes" in the "Visible" column and that should be it.