Do you have a wireless capability? Most broadband internet service providers (cable or phone) provide modems with built-in wireless. It may be there and you are just not using it. Call your internet service provider to check this out. Even if your modem
is not so equipped, they may be able to exchange yours for one that does. If you do, get them to set it up for you and ensure you protect your wireless network with a password.
That would provide you with a wireless network. Now you also need to have your computer equipped to communicate with it.
Can I presume you have a desktop PC, and not a laptop? If it is a laptop, it is already equipped.
Assuming it is a desktop...........
Most desktop PCs do NOT come with built-in wireless, although some more lately have. Check this out. Click the start globe, type device into the text box that pops up, choose Device Manager from the list. Now click the tiny yellow triangle next to Networks
and you will see a list of network devices your computer is equipped with. If it has wireless built-in, you should see 2 devices one of them being wireless. If so, you are already equipped. If that is the case and the wireless signal is strong enough to
be able to reach your wireless network, you can unplug your Ethernet cable and a new icon will appear on the bottom right of your screen near the time of day. Click on that, find your network and type in the password for your wireless network.
If you do NOT have a wireless built-in capability, you can buy a device that is not expensive or difficult. It is called a wireless USB device. It is little USB thumb drive like device, you simply plug in to your computer. Preferably in the case of a
desktop, in one of the front USB ports. Most of them just plug in and Windows itself will do all the installation for you from there. A good one with a specification of N and 300 should be around $20.