Manually enter MAC address to allowed list

[AKP]

Hi,
Looking for some quick help. I have moved in to a flat and the router is using Gargoyle for the Netgear routers.

Currently I am having problem connecting my iPhone 6 to the modem. It keep saying "Incorrect Password" although I am sure I am entering correct password. All other devices connects just fine...
One of the problem solver according to the few people who has experienced the same is to manually white-list or Include the MAC code for the phone in to router as the router may be blocking the access.

Can someone please guide me how to do this? I had a quick look at the menus and couldn't find this easily.

Thanks everyone.

[Lantis]

Connection > Basic > wireless > Enable wireless Mac filter

[AKP]

Thanks