We can't help you with that information, it's so generic that it doesn't mean anything usefull
At the very least we need the brand and model of your router
Your best bet would be to reset the router to it's default setting (there's usually a small button to do that)
And then you'd need the default password for your router, it varies depending on the brand
But the default ones are often
User : admin
Pass: empty
User : admin
Pass : admin
Also do you mean the password to use the wifi network, or the password to actually get into the router's configuration interface.