6
do as Mithrandir says..
goto amin, click system module, select find users.
you'll see at top it'll say inactive users..
in the search options near the bottom select view inactive users only and hit submit..
this will then show u all inactive users..
click edit on the user u want to view and it will return a message that the user is not activated yet, do you want to activate this account.. click yes and the user will then be activated.
he/she can then login as normal..