Auto discovery changes in config file

Hello all,
I am new to librenms so please help with these issues. I have added my snmp(v1 and v2c) community names in the config.php file and have run ./validate.php. It was showing no errors but still I am not able to see devices added on web interface.
Is there anything left I needed to do apart from saving changes to config file?

Have you followed the docs on auto discovery? Devices won’t just appear unless you run snmp-scan or have added at least one device which has a relationship with others that are discover able by the methods we have and you enable.