Can you provide a bit more details? As if you were describing the situation to a person who couldn't see.
My initial guesses are that you were in a network configuration page of a DSL Modem or Router, and the page has a standard warning to inform you that if you make changes you might need to update your PC to match the new settings.
If everything appears to be working correctly, then the message was only informative (sort of covering the DSL Router's behind) and you don't have to do anything.