Enable SNMP read-only on routers for network monitoring

[rocky <rocky2winnie@gmail.com>]

Hey,

I'm following the tutorial on http://www.aboutdebian.com/monitor.htm.
It says to configure the MRTG to monitor the router traffic, I need to
have read-only SNMP enabled on target routers. Our office does not use
Cisco routers. We are using TL-R478+ which is a chinese brand. We
manage the router by going to http://192.168.1.1. I do not see
anything indication SNMP. I checked on the manufecture's website and
could not find any clue. Can any of you tell me how can I get read-
only SNMP enabled on our office's router please?

Thanks a lot!

Blessings,
Rocky