hur sätta trådlöst på nätverket?

Vi kan säkert hjälpa dig men vi bör veta vilket modem du har (vi är inga tankeläsare).

"1. Plug the power into the router. Connect one of your computers to the router (LAN port) using an Ethernet cable.
Make sure your IP address on the computer is 192.168.0.xxx (where xxx is between 2 and 254). Please see the
Networking Basics section for more information. If you need to change the settings, write down your existing settings
before making any changes. In most cases, your computer should be set to receive an IP address automatically in
which case you will not have to do anything to your computer.
2. Open a web browser and enter http://192.168.0.1 and press Enter. When the login window appears, set the user
name to admin and leave the password box empty. Click OK to continue."

Hoppas att du har kopplat in det med nätvärks kabel för att sen logga in med ovan nämnda egenskaper.
Har du köpt begagnad, så tänk på reseta fabrikinställningarna innan du testar med logga in.