Setting VLAN ID on NETGEAR R7000 configured as an Access Point

[Whoami62]

I need to change VLAN ID, for the Guest-Net on my NETGEAR R7000, configured as an Access Point.
But when I enter the advanced setup the option for VLAN is grey, meaning I can't access this feature.

Anyone know how I can change the VLAN ID for my Guest-Net to 1212, which is configured for this purpose in my firewall?
(Replacing an old AP with this new one)

Please, help me and you'll made my day! 

Best Regards
  / Jorgen

[storm1985]

you cant do this setup with R7000 either on AP or router mode (w stock fw). Buy an AP with VLAN suport. 

[Whoami62]

Thank you Storm,
for your quick reply to my post.

Even though it wasn't the answer I was hoping for...  

Kindest Regards

/ Jörgen

[storm1985]

i know... you can do that with ddwrt fw. this is the version i have DD-WRT v3.0-r30700M kongac (09/27/16)