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    Hello Jonathan,
    the block is a Static block, you need to create a new static block with the content. Like the Documentation.
    1. Go to CMS - Statics Blocks
    2. Add new block
    3. Copy the details on the Documentation and Paste in the fields of the new block.
    4. Look at the content field... you need to change the line 3 with your account in twitter:

    < script type="text/javascript" src="" >

    Hope it helps.
    Best regards.