Dell M6220 User Configuration Manual page 1110

Figure 39-4. Pool Configuration
4 From the DNS Server Address menu, select an existing DNS Server
Address to associate with this pool, or select Add and specify a new server
to add.
5 From the Domain Name menu, select an existing domain name to
associate with this pool, or select Add and specify a new domain name.
6 Click Apply.
1110
Configuring DHCPv6 Server and Relay Settings