Configuring OpenDNS for a sub-network

The network in my house has the following topology:

ISP -----(wired)-----> Tenda Router >>>>>(Wifi)>>>>> Wifi Repeater (as a wireless bridge) -----(ethernet)-----> Netgear RAX20 Router -----(ethernet)-----> Computer

I want to block certain URL's and unfortunately my NetGear routers' inbuilt URL blocking is not working. So, I opted for OpenDNS, and completed the following:

• Configure DNS addresses on the NetGear RAX20 router. Then loading https://welcome.opendns.com/ shows a tick mark, for successful configuration.
• My ISP provides dynamic IP, so I installed OpenDNS Updater (v2.2.1)
• I flushed the DNS cache on my computer by running "cmd> ipconfig /flushdns"

However, the domains are not blocked and I am still able to access them. And the OpenDNS updater shows the error "Looks like there's no internet connectivity."

Based on my research on the OpenDNS forums, I did the following:

cmd> nslookup -type=txt debug.opendns.com
Server: UnKnown
Address: 192.168.1.1

opendns.com
primary name server = auth1.opendns.com
responsible mail addr = noc.opendns.com
serial = 1618577317
refresh = 16384 (4 hours 33 mins 4 secs)
retry = 2048 (34 mins 8 secs)
expire = 1048576 (12 days 3 hours 16 mins 16 secs)
default TTL = 2560 (42 mins 40 secs)

cmd> nslookup whoami.akamai.net
Server: UnKnown
Address: 192.168.1.1

Non-authoritative answer:
Name: whoami.akamai.net
Addresses: 2a04:e4c0:22::69
202.83.30.162

cmd> nslookup -type=txt debug.opendns.com. 208.67.222.222
Server: resolver1.opendns.com
Address: 208.67.222.222

Non-authoritative answer:
debug.opendns.com text = "server r8.mum1"
debug.opendns.com text = "flags 40020 0 50 180000000000000000003950000350000000040"
debug.opendns.com text = "originid 530971407"
debug.opendns.com text = "actype 2"
debug.opendns.com text = "bundle 13205972"
debug.opendns.com text = "source 183.82.155.46:17806"

loading this URL https://updates.opendns.com/nic/update?hostname=<network-name> returns an empty page with the following text:

good <my ip-address as shown on the OpenDNS dashboard

Am I missing something in configuring OpenDNS?