Cannot Setup DNS on Jessie

[fritz]

I have set up Jessie some time ago and have recently connected it to my 
home network however it is not resolving names via DNS. To get started I 
realize there are a few ways to set this up but I am assuming the Jessie 
install used NetworkManager. if I look in my running processes list I see:
  /usr/sbin/NetworkManager --no-daemon
Does this mean that it is presently running and subsuming the network 
management tasks?

Thanks
Fritz