Add new user - am I going mad?

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Please help me before I go nuts!!

It must be a glaringly obvious mistake that I am making, but I simply cannot see how to add, manage, create new users or groups??

I go to my dashboard, click on - 'Users and Groups' - but there is only the 5 info blocks (Site Activity, stats, help, latest news & notes).
There is nowhere for me to 'add new user' or anything similar?

Please please help.

Thanks

drkirby