Why can’t I get past the “connect to WiFi” section

[Windows 10]

Hi , I bought a dell optiplex tower and I’ve connected it up to my pc . For some reason, I can’t get my wireless mouse to work , so I’m trying to set it up with just my keyboard … I’ve managed to get the “connect WiFi ” section and I can click on it using just the keyboard , but then nothing happens. I can’t go any further than that , nor can I do anything else. I have to literally just switch it off on the monitor and the tower , I don’t want to have to send it back so can anyone help me please , I’d be very grateful. Thank you

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