I need help

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Otherwise, you can invest some bucks and look for something like this.

then you will have to either buy a range extender or get a wireless router which i would suggest the router as it will be cheaper and easier to work with

those built into the modem are nice but do not have great range due to lack of antenna to give decent range

or you could try moving your modem depending on your situation you could get some network cable to move it around in the room it is to try an extend the range

you could also try a usb wireless to hook up to your laptop those are nice for taking with you that is what i use now so i can have it hooked up to my laptop or my pc

anyhow i hope i have helped

Make sure the rotation of the antenna is good. (yes it has an antenna even if it isn't sticking out of the box.)
First result on google: http://blog.apteriks.com/2012/11/23/get-your-wireless-donut-right/