DHCP Reservation Technicolor 582N router

[#1]

I have a digital streamer (Bluesound Powernode) attached to Ethernet port 2 on my Technicolor router. However, it periodically drops offline. Bluesound have advised me to set a DHCP reservation for it on its IP address of 192.168.1.64. However, I have been unable to do so. Can anyone advise, please? 

I have selected the device from Home Networking-Devices. Then under Addressing it shows the correct IP address, but the response to 'Always use the same IP address' is 'No'. I presume I need to change this to 'Yes', but I can't find any way of doing so. 

Thanks to anyone who has any constructive ideas!

[#2 · Accepted solution]

Unable to set a static ip for your device... hmmm

Have a look at this Thread there might be a few pearls of wisdom in there for you.

[#3]

Thank you - I'd not seen the word 'Configure' in a small font. Must be my middle-aged eyes. I now have the device configured for a static IP address.