I bought a refurbished iMac and can’t set it up?

Ok so I got this off amazon it came with a wireless keyboard and mouse but I couldn’t set the computer up cus it wouldn’t connect them. So I bought a wired keyboard thinkin I could just click enter to set it up but it’s still not let me do it. The wired keyboard works because when I click tab it moves. But won’t... show more Ok so I got this off amazon it came with a wireless keyboard and mouse but I couldn’t set the computer up cus it wouldn’t connect them. So I bought a wired keyboard thinkin I could just click enter to set it up but it’s still not let me do it. The wired keyboard works because when I click tab it moves. But won’t let me click enter on continue. What can I do :(
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