I have a h/p laptop with time warner service. I'm able to use the laptop wait it's plug into the modem but not wireless. I can't remember how to sign in.

Are you sure the wireless is turned on? Most HPs have a switch to turn it on and off.

Does it work in other locations?

Is the manual switch on (as suggested above)?

Is the adapter enabled/drivers up to date?

Do you have a wireless router/modem?

Do other wireless devices work at your location?

Call time warner tech support. It's free.