I followed this link to change log-rotate configuration for RHEL 6

What should i do after i made the change to the config file?

Best Answer

logrotate uses crontab to work. It's scheduled work, not a daemon, so no need to reload its configuration.
When the crontab executes logrotate, it will use your new config file automatically.
If you need to test your config you can also execute logrotate on your own with the command:

logrotate /etc/logrotate.d/your-logrotate-config

~~Or as mentioned in comments, identify the logrotate line in the output of the command crontab -l and execute the command line~~ refer to slm's answer to have a precise cron.daily explanation