I have deleted my Mac Air's IP address in Wifi system

Guys! I m really sorry that I think I changed my IP address....You know.....When I try to join with my son's Mac Book Pro by airport......,he just changed the IP address of mine and put his IP address in my Mac Air.....Now cannot connect to INTERNET.....When I open the firefox and start finding stuff,it show me like that There's something wrong in Proxy system like that similar sentence,it show......However I don't know what to do now! Help me

System Preferences -> Network -> Advanced -> TCP/IP -> IPv4 Address:
System Preferences -> Sharing:
You can also use Applications -> Utilities -> Terminal -> ifconfig | grep inet
inet6 ::1 prefixlen 128
    inet 127.0.0.1 netmask 0xff000000
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
    inet6 fe80::6aa8:6dff:fe2d:5cd4%en1 prefixlen 64 scopeid 0x5
    inet 10.0.0.176 netmask 0xffffff00 broadcast 10.0.0.255        <<<<<------ the 10.0.0.176 is my IP address in this example

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