Help PCQ

Hi i have my PCQ set up for all of my network 192.168.1.1/192.168.1.254.

How can i get the PCQ to start from 192.168.1.19 through to 192.168.1.254

As im using the same line as my customers and i dont want to be limited as they are.
(leaving 192.168.1.1/192.168.1.18 for me)

Thanks for any advice.