BT Home Hub 5 ChromeCast Audio Static I.P.

I have just purchased a ChromeCast Audio and I'm trying to assign it with a Static I.P, I am now sure this is not possible after posting on Google Cast Help Forum.
However I followed the instructions posted by a member shown below in Red.

I have a Chromecast Audio (CCA) which I use with a HH5 in which I have assigned a static IP Address.
Assuming your CCA is up and running, go to the "Advanced Settings" page of the Home Hub admin, then click "Home Network". This will show you all the devices (wired and wireless), connected to your router.
You should see your CCA there, together with the IP Address assigned to it.
Click the name of the CCA.
Type the IP address you want to use in the appropriate box, then click "yes", where it says "Always use this IP Address".
Click "Apply", and you should be good to go. If you look at the "Home Network" page now, it should show the CCA as having the IP Address that you want.

However when it comes to the "Type the I.P. address you want"
It wont let me......The only difference between the settings from the guy who posted the very helpful reply above and mine is he has DHCP Server enabled and I don't.
Now here comes my question.
Would it mess my HH5 Router settings up i.e. port forward, static I.P's if I enabled DHCP temporarily to see if I can then input an I.P. of my choce.

Sorry for the long winded question.

Thanks in advance.

Thanks for the reply Javajoeuk.
However I'm still unable to edit the IP address even when enabling DHCP Server.

Any ideas ?

Quote from Javajoeuk

but by clicking 'Always use this IP address' yes thats it with a static ip you just use that ip for what ever purpose you need..

can i ask what you are trying to do by picking the ip?

when device is connected just click use ip yes and thats it

I can't input an IP address or even select yes to "Always Use This IP Address"

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Quote from Javajoeuk

You need to connect it to edit it its disconnected

It's just the same with a connected device.

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Quote from Javajoeuk

Now click yes and the device will always have that ip

The Yes/No Buttons and the IP Address field are inactive.

Quote from Javajoeuk

You can't alter the ip but the buttons should work

No the buttons can't be changed on any of my connected devices.

Quote from multipack

Easy solution would be to buy a decent router, the hh5 is piss poor tbh but people still insist they use them and laughably defend them.
There are far better uncrippled devices out there that dont cost a fortune and will let you set things up the way you want.

Can you recommend me a replacement for the HH5 ?

Thank you.

Quote from digi247

For people to give you an idea on router choices you need to specify are you connected with ADSL or Fibre, as the Routers with VDSL(Fibre) are a little more limited than with ADSL

I'm currently on BT Infinity 2 Fibre Optic.

Thank you.