Adding a wireless client to TC?

Hi everyone, Im stock ever here trying hard to grant access to a wireless client for 24 hours in to my LAN, but not luck till now.

This is what in the manual says;

"To allow client access to your network:
Open AirPort Utility, located in the Utilities folder in the Applications folder on a computer using Mac OS X, and in Start > All Programs > AirPort on a computer using Windows.
Select your base station and choose Manual Setup from the Base Station menu. Enter the base station password if necessary.
Choose Add Wireless Clients from the Base Station menu.
Select how you want the client to access the network:
Select PIN to enter the eight-digit number provided by the client requesting network access.
Select "First attempt" to allow network access to the first client attempting to join the network.
Select "Limit client's access to 24 hours" if you want to provide only one day of access to your network. If you don't select this option, the client will have access to your network until you remove the name from the list."


The thing here is that I can NOT find this feature within the menu in the TC, It just says Summary, time Capsule, Wireless, Guest Network and Access.
Under the Wireless tab comes nothing.

Any helpful tips will be gratefully accepted.

 

Thnaks for the reply ;

Airpor Utility is running on 5.4.2(542.22) as TC firmware is on 7.4.2.

Are those configurations the reason why these features are not longer available in the TC menu?