Problem with Login Block

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Hi,new to C5 but loving it already. I have a problem however with the Login Block downloaded from the marketplace. I have installed it through the dashboard and it appears there as an installed and currently available package but when I put the target page into edit mode to insert this login block I can't find it in the list of add on's and blocks to insert it into page. Am I missing something? How do I insert the block and where do I find it if not in the box that opens when in edit page mode?

Any help would be greatly appreciated.