>> Can i add some dns addreses to simple dns to help it ?
>> i mean can i add 18.104.22.168 to help our simple dns to resolve some sites ?
Yes - you can configure Simple DNS Plus to forward DNS requests to one or more external servers. See Options dialog / DNS / Forwarding section.
You can also forward for specific domain names only, and let Simple DNS Plus handle everything else itself.
>> i write my simple dns address for primary dns server. what should be the secondary ?
I assume that you are referring to the DNS server IP addresses used by end users (called "preferred" and "alternate" DNS servers)?
Of course the best solution for the "alternate" DNS server would be another Simple DNS Plus server, but of course you can also specify some other outside DNS server - or even leave it blank if you don't provide an alternate.
>> and is possible to add more custom for using this software ?
We are open to customizations. Let us know what you need.
>> and last one i install a kaspersky internet security to the pc to protect it.
>> is making a problem for simple dns ?
We have not heard of any problems with this.