Changing channel numbers

We have 3 APs all on channel 6. How can I change this. On the web admin under AP/settings there is an option to auto select or select an channel but neither changes the channel.
Also, with this in mind on the same page is an option to amend the APs power but if the channel is not changing how do I know the power setting is being changed.

I’m using the MAX HD2 LTE


Please open a support ticket for support team to check. Suppose auto channel is configured for the APs via the controller (MAX HD2 LTE) , channel scanning will run first before the WIFI channel is decided. For your case, look like something weird that all APs still running using the same channel. We need to know in what conditions will cause this.

You can check the “Current Output Power” for the AP via the AP details page: