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How to set Openwrt to use 1.1.1.1 DNS for example

I'm having trouble setting up one of the alternate DNS sources like 1.1.1.1 etc. Basic advise please. Thanks.

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If you want OpenWrt to forward to 1.1.1.1, go to Luci > Network > Interfaces > wan > Advanced Settings > Use custom DNS servers.

If you want clients to receive IP 1.1.1.1 as DNS, go to Luci > Network > Interfaces > lan > DHCP Server > Advanced Settings > DHCP-Options > 6,1.1.1.1,1.0.0.1.

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In new version openwrt : Luci > Network > Interfaces > wan > Advanced Settings ==>> Use DNS servers advertised by peer ==>> Use custom DNS servers

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Hmm, not sure. Could you outline the difference so I can decide. Ta.

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I understand all of this except the six and the comma. Why does the 1.1.1.1 need to have a prefix of 6, ?

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If you want your connected clients to use a certain DNS server check the LAN interface and set "6,1.1.1.1" under advanced options for the DHCP server.
If you want the router itself to use the DNS, I think you need to set it in the options for the WAN interface.

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In the wan interface's advanced setting deselect "Use DNS servers advertised by peer" and add your custom Dns addresses to "Use custom DNS servers".

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This is an excerpt from my /etc/config/network: 

config interface 'wan'
        option ifname 'eth0.2'
        option proto 'dhcp'
        option peerdns '0'
        option dns '208.67.222.123 208.67.220.123'

Alternatively, look in Luci - Network - Interfaces - Wan - Advanced Settings - Use custom DNS servers