No Internet Access

The specific problem I am facing is that all 3 devices, that have their DNS settings set to the pi-hole's IP address, do not have access to the internet.
How do I configure my router to use PiHole's address? Do I have to port forward and turn off DHCP?

The output of

echo ">stats" | nc localhost 4711

is as follows:

domains_being_blocked 131192
dns_queries_today 463
ads_blocked_today 17
ads_percentage_today 3.671706
unique_domains 64
queries_forwarded 258
queries_cached 188
clients_ever_seen 3
unique_clients 3
dns_queries_all_types 471
reply_NODATA 9
reply_NXDOMAIN 0
reply_CNAME 0
reply_IP 12
status enabled
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