Dear Team,
                  we have a set of customers and i want to manage those customers in a group.
how can it b possible?

when i click this link..[ Customer Users <-> Groups ]
im getting a message like this,
""""Warning: Sorry, feature not active!
Comment: CustomerGroupSupport needs to be active in Kernel/Config.pm, read more about this feature in the documentation. Take care!""""'


wat should i do for this?
pls give the steps that i want to do.....