Restart the router
When you are finished with the changes with the router, you will need to restart the router. To do this, Just unplug the power cord to the router and leave it disconnected for two minutes. This will cause no harm to any of your computers.
WARNING!!!
Do not restart the router if someone is online. The internet connection will be lost when you disconnect the router. The person will loose any activity that they was in the process of doing.