Unless you've installed a wireless card in your old desktop you will never connect wirelessly.
Desktops don't come equiped to do wireless communications. And an "old Gateway" surely does not have those capabilities.
You have 2 options
1) Purchase and install a wireless card for your Gateway
2) Use it hard wired... Purchase an "Ethernet cable" of sufficient length and plug it into one of the open ports on the back of the router and into the only place it will fit on the back of your computer
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