8800axl Sky Fibre problems

[Bullstein]

Ok

So in resigned to using this router alongside a bt modem, it's no big deal really, the improved wifi is worth it

But can someone please advise me on the exact way to put my PlayStation 4 into the DMZ?

I've done this on lol loads of routers before but looking to reserve an address on the 8800axl is very unclear. I can find the DMZ part but reserving an address is not clear so any pointers would be appreciated

[Bullstein]

[billion_fan]

To reserve a IP address for a device on your network follow the steps below

1. Login to the Billion router
2. Click on 'Configuration >> LAN'
3. In the middle of the page you will see a 'Static IP Lease List' option
4. Click on the 'Add' button under 'Static IP Lease List'
5. Enter a 'Host Label' eg PS4
6. Enter the MAC address of your PS4
7. Enter a 'IP Address' outside the DHCP range eg 192.168.1.200
8. Click on 'Apply'
9. Enter the IP address you entered in step 7 into the DMZ section and click on 'Apply'
10. Restart your PS4 so it obtains the new IP address

[Bullstein]

Thank you