Hi, have an old Lenovo keyboard which I want to use while my laptop keyboard is not functioning. Noticed that it’s missing the “enter key” and asked a friend who said he had the same (nonfunctioning) keyboard and he gave me the key. But I’m not sure how to make this fit. I’ve tried to press it down, with and without the metal thing, but it’s not clicking. Is this the right key? Is something on the keyboard broken that’s preventing the fit? I’ve taken a picture of its top and bottom. Thanks for helping a newbie.

https://i.imgur.com/oHsAix0.jpg