Ok, then I will return these and ask for a new one that can do this. Thanks @Kevin_Z

@Kevin_Z Really I have AC1200 C5 v4 but I can't choose this. On my Archer AC1200 C50 I can use this. Here you have a screenshot of this.

Hello guys, I bought 5 routers AC1200 C5 v.4 I am trying to use it as an access point and I need an IP address reservation for some users. When I turn on the router, I have the "Advanced" page and...