Hi Sallie,
As i understand from your post you want to flush dns, click start -> Run & Type -> ipconfig /flushdns -> Click ok.
To release IP address you can type (in Start -> Run)->
ipconfig /release_all
or
ipconfig /release
To Renew IP address:
ipconfig /renew
Other way to release and renew ip address is Click on Start -> Settings -> Control Panel -> Network Connections -> Right Click Local Area Connection and select repair (This will release and renew your ip address).
Hope this helps.