reserve ip address range on 2704N router

[#1]

Hi, how do you reserve an ip address range on the PlusNet 2704N router?  I need a few devices at known addresses then the rest can go with DHCP..

[#2]

I think I just found the answer, so for anyone else struggling with the crippled router.
Very helpful post from Eva:
Some additional options e.g. turn DHCP on/off, limit DHCP address range, reserve addresses and some other things are available via the Sagemcom GUI i.e.
http://192.168.1.254/expert_user.html

Original Post: http://www.ispreview.co.uk/index.php/2015/01/isp-plusnet-launch-faster-hub-zero-2704n-broadband-rout...

[#3]

Just to confirm, it worked fine.  I changed the address range on the lan tab and added the devices with fixed ip's that I wanted.
For info when I chatted to Plusnet support they said their router doesn't do it.