How to clean all airport connections and start setting from the begining

I made some mistakes setting airport and now i cant get rid of thosе  setting to manage my connections "from the clean sheet". How to delete my network settings?

If you are referring to the wireless network settings on your Mac computer, it's a two step process.
Step One
Open System Preferences (gear icon on the dock)
Open Network
Click on AirPort on the left
Click Advanced at the lower right
Click to highlight a connection in the list
Click the - (minus) button at the bottom of the list to delete the connection
Repeat as needed for other connections
Step Two
Open Macintosh HD > Applications > Utiities
Open KeyChain Access
Locate a listing with name of the wireless network and click to highlight it
Click delete
Repeat as needed to delete all networks that you don't want
If you have an Apple wireless router and are referring to the wireless network settings on that device....
Open Macintosh HD > Applications > Utilities > AirPort Utility
Click Manual Setup
Click on the Wireless tab just below the row of icons for the settings page
Click Update after you have made the changes that you want

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