Assuming you are anope 1.8.5 like myself..
Assuming you have correctly set up services.conf
Assuming you know how to edit services.conf correctly.
This is advice only and is only to be undertaken if you know what you are doing. If you are unsure in anyway then wait for one of the senior devs on the forum to reply and do not touch your services.conf as it can totally mess up your services if you get it wrong.
The below information is based purely on what I did with MY server configuration ONLY yours may be different
1. open services.conf
2. find NickServ Configuration
3. look for this...
NSDefNone <-- uncomment
then... look below in your services.conf and you should see something like...
NSDefKill
#NSDefKillQuick
NSDefSecure
#NSDefPrivate
NSDefHideEmail
NSDefHideUsermask
#NSDefHideQuit
#NSDefMsg
NSDefMemoSignon
NSDefMemoReceive
NSDefAutoop
you will see some have a # next to them...
4. uncomment NSDefKill
5. save and close
6. restart services to make effect change
7. should be then done.